zener diode is a very versatile semiconductor that is used for a variety of industrial processes and allows the flow of current in both directions.It can be used as a voltage regulator. State Fleming's Left Hand rule . Consider a rod with length l and a uniform cross-sectional area A. We and our partners use cookies to Store and/or access information on a device.We and our partners use data for Personalised ads and content, ad and content measurement, audience insights and product development.An example of data being processed may be a unique identifier stored in a cookie. Magnetic field due to a long current carrying solenoid. Current-carrying conductors come in a variety of forms and sizes. Now your experimental setup is ready. Tamil Nadu Board of Secondary Education HSC Science Class 12th. Suggested for: Magnetic Field due to a Long Straight Wire (Proof) You can easily determine the direction of magnetic field using right hand rule (this rule has been explained many times in previous articles) which in this case is into the screen (away from you). Note -. Consider a straight current carrying conductor of length $2a$ as shown in Figure 1. A current carrying conductor when placed in a magnetic field experiences a force and then moves. THERMODYNAMICS Derive the expression for the force on a current-carrying conductor in a magnetic field. Developed by Therithal info, Chennai. Force on a current-carrying conductor in a uniform magnetic field. This shows that magnetic field lines produced by a straight conductor (wire) is in form of concentric circles. Are you sure you want to hide this comment? The path of magnetic lines of force may be decided by means of Maxwells corkscrew rule or right-hand grip rule. This magnetic field around the wire seems like a concentric cylinder as a whole but if we take one plane of their cross-section then it appears as a concentric circle, see figure above. Charge both generates and interacts with an electric field. We could suppose that because moving charge interacts with a magnetic field, it also creates one. This cause tendency to have a stronger and uniform magnetic field inside the coil. 1. This can be determined by taking the cross product between two vectorsand(let it ben^). Current-carrying conductors come in a variety of forms and sizes. From the Figure 3.39, in a right angle triangle PAO, This is the magnetic field at a point P due to the current in small elemental length. Conversion of galvanometer into an ammeter and a voltmeter. Get subscription and access unlimited live and recorded courses from Indias best educators. The above result gives magnetic field due to a current carrying straight conductor of infinite length. India's #1 Learning Platform Start Complete Exam Preparation Daily Live MasterClasses Magnetic Field due to a Straight Current Carrying Wire of Infinite Length Since, the length of the wire is infinite, hence the ends x and y are at infinite distance. (d) Determine the magnetic field at P due to wire A, using B 1 = 2 x 0 i 1 The distance between $dl$ at $y$ and the point $p$ at $x$ is $r = \sqrt{x^2 + y^2}$. Biot-Savart law and its application to current carrying circular loop. We shall anticipate one kind of mobile carriers as in a conductor (right here electrons). htm. If the wire has an arbitrary shape, we shall compute the Lorentz force on it by considering it as a group of linear strips dlj and summing. example Magnetic field inside and outside a long straight current carrying wire A magnetic field with varying area will also exert a force on a number of non-magnetic substances by altering the movement of their outer atomic electrons. Therefore, the internal angle made by them at point P would be 1 = 2 = 2 2 Therefore, from equation (7) magnetic field due to a straight current carrying wire of infinite length, Consider a long straight wire NM with current I flowing from N to M as shown in Figure 3.39. Consider, to represent the numerical density of those cell charge carriers. The field lines are in the form of concentric circles at every point of the current-carrying conductor. Magnetic fields surround magnetised substances, and are created by electric powered currents along with the ones utilised in electromagnets, and by electric powered fields varying in time. 4. When you sprinkle iron filings on the plane of the cardboard and after giving some gentle jerk, it tries to align in the direction of the magnetic field produced by the electric current and the direction of the magnetic field is perpendicular to the conductor. Here, l is a vector of value length, that is the length of the rod, having a direction similar to current I. The current in wire 1 is in the opposite direction of wire 2. It forms concentric circles around the conductor. So, draw a circle with radius r and center at the wire (from . The nature of the magnetic field lines around a straight current-carrying conductor is concentric circles with the center at the axis of the conductor. Ans. The magnetic field due to a long straight current-carrying wire is given by: B = 0 I 2 r. Magnetic field B is dependent on the current (I) and radial distance from the wire (r). So, magnetic field due to straight current carrying conductor (infinitely long) is given by B = 0 I 2 r Where, 0 = 4 10 7 T m A 1 and it is the permeability of free space, I is the current flowing in the long straight conductor and r is the distance of the magnetic field from that straight conductor. This can be determined by taking the cross product between two vectors, This is the magnetic field at a point P due to the current in small elemental length. if the route of current along the conductor is inward from the reference plane, the magnetic lines of force (or flux strains) will travel clockwise. Because charges are moving inside the conductor, a current-carrying wire produces a magnetic field. Consider an element of length dlof the wire at a distancelfrom point O andbe the vector joining the element dlwith the point P. Let be the angle betweenand. Its S.I. Because of the moving charges in the conductor, the current-carrying conductor works as an electromagnet and generates its own magnetic field. This means a high electric current produces a strong magnetic field and a low electric current produces a weak magnetic field. Flux is a concept in implemented arithmetic and vector calculus with numerous physical applications. Force on a moving charge in uniform magnetic and electric fields. Some of our partners may process your data as a part of their legitimate business interest without asking for consent. The direction of the field is perpendicular to the plane of the paper and going into it. Solved Examples on Magnetic Field Due to Straight Wire Example 1: A wire of 60 cm in length carries a current I= 4 A. The iron fillings arrange themselves in form of concentric circles around copper wire. The direction of the magnetic field around the straight current-carrying conductor is given by the right-hand thumb rule. When a current-carrying conductor is put in a magnetic field, the conductor is subjected to a force that causes the conductor to move. Average Power Associated With A Resistor Derivation - Laws Of Nature. To find the magnetic field due to a finite-length straight wire carrying a constant current has no sense (it violates the continuity equation). Follow these steps to set up your activity. The above summation may be converted to an integral in many cases. Magnetic field due to long straight conductor carrying current. Also, this magnetic field forms concentric circles around the wire. Expression for energy and average power stored in a pure capacitor, Expression for energy and average power stored in an inductor, Average power associated with a resistor derivation, Magnetic field due to a straight current-carrying conductor, MAGNETIC FIELD DUE TO STRAIGHT CURRENT-CARRYING CONDUCTOR, CHARACTERISTICS OF MAGNETIC FIELD DUE TO STRAIGHT CURRENT-CARRYING CONDUCTOR, Biot-Savart Law | statement and applications | Biot-Savart Law formula derivation class 12, Elasticity | Core idea, definition, Stress and Strain class 11. On one occasion at the end of his lecture, he placed a wire carrying current parallel to a compass needle. Upon reversing the current in the wire, the needle deflected in the . current-carrying conductor in a uniform magnetic field, force between twoparallel current-carrying conductors-definition of ampere, torque experienced by a current loop in uniform magnetic field; moving coil galvanometer - its sensitivity. If the current is flowing away from the observer, i.e. A magnetic field is a vector field that describes the magnetic influence on moving electric charges, electric currents, [1] : ch1 [2] and magnetic materials. All known magnetic fields are caused by current charges (or moving charges). A current is passed through the wire by connecting its ends to a battery. Inductance. The current carrying conductor generates it own magnetic field around it. The field strength depends on the magnitude of the current, and follows any changes in current. Ans. The higher the current, the stronger the magnetic field. field across the conductor because of the current via it and the externally carried out field will have interaction with each other. Download our apps to start learning, Call us and we will answer all your questions about learning on Unacademy. A magnetic field is a vector field that describes the magnetic effect on moving electric charges, electric currents and magnetic substances. Copyright 2022 | Laws Of Nature | All Rights Reserved. (a) They would tend to move together. 63,669. Enter the email address you signed up with and we'll email you a reset link. Magnetic Field around a Current Carrying Conductor As the current is defined as the rate of flow of electric charge. We know the current-carrying conductor produces a magnetic field around itself. 2) Inversely proportional to distance r from the center. Here the result of the integration is shown, that is, \[B = \frac{\mu_0I}{4\pi}\frac{2a}{\sqrt{x^2 + a^2}}\], For an infinitely long current-carrying conductor, the value of $a$ is large enough that we can neglect $x$ entirely, that is for $a >> x$, the magnetic field is. The combination of magnetic fields means the vector sum of . Using the right-hand rule 1 from the previous chapter, d x r ^ d x r ^ points out of the page for any element along the wire. B = 2 r 0 i (c) Find the directions of the magnetic field at 'P' due to two wires A and B, using right hand thumb rule. Furthermore, the direction of the magnetic field depends upon the direction of the current. Cyclotron. Magnetic Field Strength Outside a Long Current Carrying Conductors: Consider a straight long conductor carrying current of I amperes in downward direction. Then there are, total mobile charge carriers in it. Flux may be considered as imaginary lines via which a physical amount can travel. The term "motional EMF" is applied to this phenomenon, since the EMF is due to the motion of the wire. . You need these materials to perform this activity. We determine the magnetic field of a straight wire at a field point. 3, alignment of iron filings on the cardboard in the influence of magnetic field ($\mathbf{B}$), source: nzdl.org. This force can easily be large enough to move the wire, since typical currents consist of very large numbers of moving charges. Consider a rod with length l and a uniform cross-sectional area A. Consider an infinitely long conductor AB through which current I flows. Its SI unit is Tesla but sometimes Weber and gauss are also used as units of the magnetic field. Magnetic Effect of Electric Current Class 12th - Magnetic Field Due to Straight Current Carrying Conductor | Tutorials Point Tutorials Point (India) Ltd. 3.02M subscribers Subscribe 175K. Magnetic Fields of Long Current-Carrying Wires B = o I 2 r I = current through the wire (Amps) r = distance from the wire (m) o = permeability of free space = 4 x 10 -7 T m / A B = magnetic field strength (Tesla) I. If this doesn't solve the problem, visit our Support Center . Figure 22.7. walterfendt. If the wire has an arbitrary shape, we shall compute the Lorentz force on it by considering it as a group of linear strips, Magnetic field due to straight current carrying conductor, Let AB be the conductor through which current I flows. The magnetic field produced has the following characteristics: It encircles the conductors and lies in a plane perpendicular to the conductor. Insert the wire from the center of the plane cardboard before connecting it to the battery. Because charges are moving inside the conductor, a current-carrying wire produces a magnetic field. Let the conductor be influenced only by the field produced by the current flowing through it (no external filed). document.getElementById("ak_js_1").setAttribute("value",(new Date()).getTime()); Laws Of Nature is a top digital learning platform for the coming generations. Using the Biot-Savart law, the magnetic field at point, Kerala Plus One Result 2022: DHSE first year results declared, UPMSP Board (Uttar Pradesh Madhyamik Shiksha Parishad). If the direction of current flow reverses then the direction of the magnetic field is also reversed. $$1T=10^4G(gauss)$$ $$1T=1Wb m^{-2}$$. Enter your email address below to subscribe to our newsletter, Your email address will not be published. Theta is the outside angle in that diagram, pi-theta makes it the inside angle so that you can use the simple definition (sin theta = opp / hyp) to remove the theta from the equation. It will become hidden in your post, but will still be visible via the comment's permalink. Despite its increasingly dated content, with quaint references to microfiche, magnetic tapes, and Fortran-77 language examples, the first edition has continued to sell well for three decades. Interesting Facts Let 'P' be a point at a perpendicular distance 'a ' from the conductor. Magnetic field intensity due to a straight current-carrying conductor of finite length As we know, current-carrying conductors experience magnetic fields. We determine the magnetic field of a straight wire at a field point. Furthermore electric field lines start and end at the charges but magnetic field lines always form closed loops never ending at a point. Straight wires are largely used and the expression of magnetic field for such cases is important. 14,806. While for the rest of the space the lines are so widely spaced that the magnetic field is negligible. We shall anticipate one kind of mobile carriers as in a conductor (right here electrons). Consider a circular path of radius \ (r\) passing through the point \ (P\). The magnetic field produced by a current-carrying conductor is proportional to the current and the distance bet Ans. Unacademy is Indias largest online learning platform. 27. We determined the electric field of a straight wire of infinite length and determined an expression $E = \lambda / 2\pi\,\epsilon_0x$ which is similar to the expression of magnetic field just determined. The magnetic field created by a conductor is affected by its form. A long cylindrical coil having large number of turns is known as solenoid. The magnetic field produced due to a current-carrying conductor has the following characteristics: It encircles the conductor. Consider a point P, placed at a certain distance from the midpoint of the conductor. Electrons in metals like copper and aluminium are strewn throughout. Right Hand Curl Rule. Read on to know more. Therefore, the net magnetic field at the point P which can be obtained by integratingdby varying the angle from = 1to = 2is, For a an infinitely long straight wire, 1= 0 and 2= , the magnetic field is. Two parallel wires, each carrying a current of I = 3.1 A, are shown below, where d = 5.2 cm. . It lies in a plane and perpendicular to the conductor. The produced electric field and magnetic field are perpendicular to each other. MECHANICS Relevant Equations:: It is not a direct home work problem, i was thinking if a sine wave current passes through the straight current carrying conductor, what . Consider a straight conductor AB carrying a current (I) and determining the magnetic field intensity at point P. Let AB be the conductor through which current I flows. Let 'dl' be a small current element at a distance 'r' from 'P'. Electrons in metals like copper and aluminium are st Ans. (b) Write the formula to find the magnetic field due to a long straight current carrying wire i.e. Magnetic field due to straight conductor carrying current - QuantumStudy Magnetic field due to straight conductor carrying current Consider a straight conductor carrying current 'i'. WAVES Question 2 The magnetic field intensity due to a straight current-carrying filamentary conductor is given by, I (cosa, - cosa ); 4 Where a2 and a are angles subtended by upper and lower ends of the conductor at certain location P, respectively. Understand the concepts of Zener diodes. Show that for a straight conductor, the magnetic field, In a right angle triangle OPN, let the angleOPN = 1which implies, 1= /2 1and also in a right angle triangle OPM,OPM = 2which implies, 2= /2 + 2, Privacy Policy, Consider a point, , placed at a certain distance from the midpoint of the conductor. Just as the electric field in space is proportional to the charge that acts as its source, the magnetic field in space around an electric current is proportional to the electric current that serves as its source. How to find the direction of the magnetic field due to the current-carrying conductor? DMCA Policy and Compliant. Magnetic Field Due To A Long Straight Wire Derivation. We know that static electric charges create an electric field around itself whose magnitude depends on the value of charge and the distance of the point where we want to find the electric field. It is necessary to define the theory behind these notions in order to better comprehend the nature and behaviour of the magnetic field created by these conductors. If you would like to change your settings or withdraw consent at any time, the link to do so is in our privacy policy accessible from our home page. The consent submitted will only be used for data processing originating from this website. A mobile charge in a magnetic field is subjected to a force that is perpendicular to both the mobile charges motion and the magnetic field. When you move a magnet around a coil of wire, or a coil of wire around a magnet, the electrons in the wire are pushed out and an electrical current is created. Tags : Biot - Savart Law | Physics , 12th Physics : Magnetism and Magnetic Effects of Electric Current, Study Material, Lecturing Notes, Assignment, Reference, Wiki description explanation, brief detail, 12th Physics : Magnetism and Magnetic Effects of Electric Current : Magnetic field due to long straight conductor carrying current | Biot - Savart Law | Physics, Magnetic field due to long straight conductor carrying current, Biot - Savart Law: Magnetic field due to long straight conductor carrying current, to long straight conductor carrying current, Consider a long straight wire NM with current I flowing from N to M as shown in Figure 3.39. Creating Local Server From Public Address Professional Gaming Can Build Career CSS Properties You Should Know The Psychology Price How Design for Printing Key Expect Future. Magnetic Field due to straight current carrying conductor || Class 12 physics ||Magnetic field intensity due to a straight current-carrying conductor of fini. Once unpublished, all posts by physics-notes will become hidden and only accessible to themselves. In this article we will learn about Magnetic Field, Units of Magnetic Field, Flemings Left-Hand Rule, Flux, Magnetic Flux, Magnetic force in current carrying conductor derivation and Magnetic field due to straight current carrying conductor. Compare it with Earth's magnetic field. When current is passed through a straight current-carrying conductor, a magnetic field is produced around it. PhysicsTest said: Homework Statement:: To find the magnetic field in a straight current carrying conductor due to sine wave at a distance x on its perpendicular bisector. Electrons are pulled and pushed by moving magnetic fields. We use cookies to ensure that we give you the best experience on our website. To view the purposes they believe they have legitimate interest for, or to object to this data processing use the vendor list link below. And the angle between $d\vec l$ and $\vec r$ is $\theta$. Learn about the zeroth law definitions and their examples. Ans. On the other hand, at any inside point, the field due to each coil will be additive in nature. Take a point at a distance of r from the wire, this is the point where we want to find the magnetic field. Then, the magnetic field at P dueto the element is. Find the direction and magnitude of the net magnetic field at points A, B, and C. 1. This is an expression for magnetic induction at a point on the axis of . Using Biot-Savart law, the magnetic field $dB$ due to the current element of length $dl = dy$ is, \[dB = \frac{\mu_0}{4\pi}\frac{I\,dy\sin \theta}{r^2} = \frac{\mu_0}{4\pi}\frac{I\,x\,dy}{(x^2 + y^2)^{3/2}} \]. When a current-carrying conductor is placed in a magnetic field the wire experiences a force due to the interaction between the field and the magnetic field produced by the moving charges in the wire. [latexpage]. Ans. Using the Biot-Savart law, the magnetic field at point P due to current carrying element dl is. If the direction of current in the conductor is reversed then the direction of magnetic field also reverses. This will cause a tendency to have zero magnetic fields outside the coil. (b) A long and straight wire creates a field with magnetic field lines forming circular loops. The magnetic field can be visualised by counting the number of closed magnetic lines of force that pass through the conductor. Ans. It is generated from the Lorentz force laws magnetic portion. It is denoted by the capital letter B. In physics, Flux is described as any impact that looks to pass or travel (whether or not it honestly moves or not) via a surface or substance. l be the distance between centre of the coil and elementary length dl. code of conduct because it is harassing, offensive or spammy. When we derive the equation of a magnetic field produced by a long straight current-carrying wire, we do something like this: Imagine a wire carrying a constant current I. A charge produces an electric field and also interacts with that field. The magnetic field exerts a force on a current-carrying wire in a direction given by the right hand rule 1 (the same direction as that on the individual moving charges). The result obtained is same as we obtained in equation (3.39). This force can easily be large enough to move the wire, since typical currents consist of very large numbers of moving charges. We can detect a magnetic field surrounding a current carrying conductor by bringing a magnetic needle or a comp Ans. Solution: As derived from above the formula, magnetic field of a straight line is denoted as: B = I 2 r = 4 10 7 .4 ( 2 0.6 m) = 13.33 10 7 Once unpublished, this post will become invisible to the public Manage Settings Allow Necessary Cookies & ContinueContinue with Recommended Cookies. In other electrical generators, the magnets move, while the conductors do not. Hence the total electric current flowing through the rectangular path is nLI. Did you see any patterns on the cardboard? And how this pattern is looking? Magnetic Field between Two Loops Two loops of wire carry the same current of 10 mA, but flow in opposite directions as seen in Figure 12.13. Moving charge produces magnetic field, and a wire carrying current produces magnetic field around it. A moving charge in a magnetic field experiences a force perpendicular to its own velocity and to the magnetic field. When electric current starts flowing through the wire then sprinkle some iron filings on the cardboard and give some little jerk to the cardboard with your fingers. The magnetic field is perpendicular to the wires direction. is the SI unit for magnetic fields. is done on EduRev Study Group by Class 10 Students. This is quite surprising, bearing in mind the tremendous development of the field and the computer technologies on which it is based. Thanks for keeping TyroCity safe. The wire is perpendicular to the x-axis and the the x-axis bisects the wire. When a current-carrying conductor is put in a magnetic field, the conductor is subjected to a force that causes Ans. But we also know that when these charges start moving with constant acceleration then it creates an electric field as well as a magnetic field. This interracts with the external magnetic field. Your email address will not be published. One loop is measured to have a radius of R = 50cm R = 50 cm while the other loop has a radius of 2R = 100cm. Consider n to represent the numerical density of those cell charge carriers. The magnetic field created by a conductor is affected by its form. The magnetic field is proportional to the distance from the wire, that is it decreases by increasing the distance from the wire. Once suspended, physics-notes will not be able to comment or publish posts until their suspension is removed. If current is increased then Magnetic Field produced by it is stronger. We can detect a magnetic field surrounding a current carrying conductor by bringing a magnetic needle or a compass near it and seeing if the needle of the compass deflects. The lower end of the wire is at $y = -a$ and the upper end at $y = a$. What is the distance of closest approach when a 5.0 MeV proton approaches a gold nucleus ? Note that we have expressed the magnetic field OP in terms of angular coordinate i.e. A current-carrying wire in a magnetic field must therefore experience a force due to the field. If the gaps between the concentric circles are small then it shows a strong magnetic field and if it is large then it shows a weak magnetic field. Tesla (T) is the SI unit for magnetic fields. Terms and Conditions, When a current-carrying conductor is placed in a magnetic field, a force occurs on the conductor in a path that is perpendicular to both the current and the magnetic field lines. The magnitude of the magnetic field is proportional to the value of the electric current passing through the wire and the distance of the point where we want to find the magnetic field and its value also depends on the angle between the direction of the current element and the distance vector of the point. The combined motion of the electric field and the magnetic field is called electromagnetic waves. We determine the magnetic field due to the wire at the field point $p$ at perpendicular distance $x$ from the wire. SITEMAP Note that here n^ represents the unit vector from the point O to P. Calculate the magnetic field at a point P which is perpendicular bisector to current carrying straight wire as shown in figure. Magnetic field, Field lines, Field due to a current carrying conductor, Field due to current carrying coil or solenoid; Fleming's left-hand rule. The strong magnetic field produced inside a solenoid can be used to magnetize a piece of magnetic material like soft iron when placed inside a coil. Consider dl be the small current carrying element at point c at a distance r from point p. be the angle between r and dl. Prev Page Next Page A large number of such loops allow you combine magnetic fields of each loop to create a greater magnetic field. It is generated from the Lorentz force laws magnetic portion. Prepare here for CBSE, ICSE, STATE BOARDS, IIT-JEE, NEET, UPSC-CSE, and many other competitive exams with Indias best educators. See figure below: The magnetic field is a vector quantity because it has both magnitude and direction. If concentric circles are closer to each other, they denote more current. We may also expect each mobile carrier to have an average drift velocity vd for a constant current I in this conducting rod. Thank you, I fully understand the derivation now! If concentric circles are wide apart, they denote less current in . Required fields are marked *. The strength of the field is directly proportional to the magnitude of the current. Keep the middle wire straight and named it X and Y, as shown above. Once unsuspended, physics-notes will be able to comment and publish posts again. 11.4 Magnetic Force on a Current-Carrying Conductor - University Physics Volume 2 | OpenStax Uh-oh, there's been a glitch We're not quite sure what went wrong. magnetic field of straight conductor - it is a distribution of magnetic field, which can be calculated analytically, assuming radial symmetry of the conductor (round wire), infinite length, isotropic magnetic permeability of the conductor and the material or medium around it, uniform current in the wire, and frequency and distances low enough for And this magnetic field lines in the plane of the cardboard and is perpendicular to the conductor. Now, what did you see on the cardboard? Let O be the point on the conductor as shown in figure. The Questions and Answers of Magnetic field lines due to a straight wire carrying current are? The magnetic induction at any point in the magnetic field is defined as the magnetic flux passing through the unit area at that point. We're a place where students share, stay up-to-date, learn and grow. The magnitude of the magnetic field produced by a current carrying straight wire is given by, Given: r = 2 m, B = 5. TERMS AND PRIVACY POLICY, 2017 - 2022 PHYSICS KEY ALL RIGHTS RESERVED. According to this rule - when you catch the wire in your fist such that your thumb points the direction of the electric current then your curled fingers denote the direction of the magnetic field around the wire. They can still re-publish the post if they are not suspended. For further actions, you may consider blocking this person and/or reporting abuse. definition Magnetic field due to an infinitely long straight current carrying wire B= (2r) 0I where B is the magnitude of magnetic field, r is the distance from the wire where the magnetic field is calculated, and I is the applied current. When the cardboard is gently tapped, it is found that the iron filings arrange themselves along with concentric circles. Save my name, email, and website in this browser for the next time I comment. Case (ii): unit is Wb/m or tesla (T). Lets understand the behavior of the magnetic field around a straight current-carrying conductor through an experiment/activity. Consider the small current-carrying element dl placed at point E. It is at a distance r from point p l denotes the distance between the coils centre and dl denotes the length. Unflagging physics-notes will restore default visibility to their posts. Reversal in the current flow direction reverses the field's direction. It is at a distance r from point p l denotes the distance between the coils centre and dl denotes the length. The strength of the field at any point is. Namaste Everyone Welcome to My YouTube channel @ChasePhysics6789 In this Video I have Explained derivation of Magnetic field due to straight current carrying. 28. It is denoted by letter "B". Straight wires are largely used and the expression of magnetic field for such cases is important. (ii) Magnetism and Matter A current loop as a . Supply electric current in the wire. This discussion on Magnetic field lines due to a straight wire carrying current are? Therefore, the net magnetic field at the point P which can be obtained by integrating, For a an infinitely long straight wire, . Let P be the point at a distance, The direction of the field is perpendicular to the plane of the paper and going into it. Magnetic field dueto long straight conductor carrying current, Consider a long straight wire NM with current I flowing from N to M as shown in Figure 3.39. 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