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# Moving Charges and Magnetism Class 12 Notes Physics

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## CBSE Guide Moving Charges and Magnetism class 12 Notes

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## Class 12 Physics notes Chapter 4 Moving Charges and Magnetism

Download CBSE class 12th revision notes for chapter 4 Moving Charges and Magnetism in PDF format for free. Download revision notes for Moving Charges and Magnetism class 12 Notes and score high in exams. These are the Moving Charges and Magnetism class 12 Notes prepared by team of expert teachers. The revision notes help you revise the whole chapter 4 in minutes. Revision notes in exam days is one of the best tips recommended by teachers during exam days.

## CBSE Class 12 Physics Revision Notes Chapter 4 Moving Charges and Magnetism

Biot – Savart law: The magnitude of Magnetic Field $d\overrightarrow{B}$ is proportional to the steady current I due to an element $d\overrightarrow{l}$ at a point P and inversely proportional to the distance r from the current element is,

• Magnetic field due to long straight current carrying conductor:
• If conductor is infinitely long, $B = {{{\mu _o}I} \over {2\pi a}}$
• Right-hand rule is used to find the direction of magnetic field due to straight current carrying conductor.
• Force on a Straight Conductor: Force F on a straight conductor of length $l$ and carrying a steady current I placed in a uniform external magnetic field B, $\overrightarrow{F}=I(\overrightarrow{l}\times\overrightarrow{B})$
• Lorentz Force: Force on a charge q moving with velocity v in the presence of magnetic and electric fields B and E.$\overrightarrow{F}=q(\overrightarrow{v}\times\overrightarrow{B}+\overrightarrow{E})$
• Magnetic Force: The magnetic force $\overrightarrow{{{F}_{B}}}=q(\overrightarrow{v}\times\overrightarrow{B})$ is normal to $\overrightarrow{V}$ and work done by it, is zero.
• Cyclotron: A charge q executes a circular orbit in a plane normal with frequency called the cyclotron frequency given by, ${{v}_{c}}=\frac{qB}{2\pi m}$
This cyclotron frequency is independent of the particle’s speed and radius.
• Magnetic Field due to Circular current carrying Coil: Magnetic field due to circular coil of radius ‘a’ carrying a current I at an axial distance r from the centre-
$B=\frac{{{\mu}_{0}}I{{a}^{2}}}{2{{({{r}^{2}}+{{a}^{2}})}^{3/2}}}$
At the centre of the coil, $B=\frac{{{\mu }_{0}}I}{2a}$
• Ampere’s Circuital Law: For an open surface S bounded by a loop C, then the Ampere’s law states that $\oint\limits_{C}{\overrightarrow{B}.d\overrightarrow{l}}={{\mu }_{0}}I$ where I refers to the current passing through S.
• If B is directed along the tangent to every point on the perimeter, then $BL={{\mu }_{0}}{{I}_{e}}$ Where Ie is the net current enclosed by the closed circuit.
• Magnetic Field: Magnetic field at a distance R from a long, straight wire carrying a current I is given by, $B=\frac{{{\mu }_{0}}I}{2R}$
The field lines are circles concentric with the wire.
• Magnetic field B inside a long Solenoid carrying a current I: $B={{\mu }_{0}}nI$ Where n is the number of turns per unit length.
• For a toroid, $B=\frac{{{\mu }_{0}}NI}{2\Pi r}$ Where N is the total numbers of turns and r is the average radius.
• Magnetic Moment of a Planar Loop: Magnetic moment m of a planar loop carrying a current I, having N closely wound turns, and an area A, is $\overrightarrow{m}=NI\overrightarrow{A}$
• Direction of $\overrightarrow{m}$ is given by the Right – Hand Thumb Rule: Curl and palm of your right hand along the loop with the fingers pointing in the direction of the current, the thumb sticking out gives the direction of
• Loop placed in a Uniform Magnetic Field:
1. When this loop is placed in a uniform magnetic field B, Then, the force F on it is, F = 0
And the torque on it is $\overrightarrow{\tau}=\overrightarrow{m}X\overrightarrow{B}$
In a moving coil galvanometer, this torque is balanced by a counter torque due to a spring, yielding.
$k\phi =NI\text{ AB}$ Where $\phi$ is the equilibrium deflection and k is the torsion constant of the spring.
• Magnetic Moment in an Electron: An electron moving around the central nucleus has a magnetic moment , given by
${{\mu }_{l}}=\frac{e}{2m}l$ Where $l$ is the magnitude of the angular momentum of circulating electron about the central nucleus.
• Bohr Magneton: The smallest value of ${{\mu }_{l}}$ is called the Bohr magneton μBOr

## CBSE Class-12 Revision Notes and Key Points

Moving Charges and Magnetism class 12 Notes. CBSE quick revision note for class-12 Physics, Chemistry, Maths, Biology, and other subject are very helpful to revise the whole syllabus during exam days. The revision notes covers all important formulas and concepts given in the chapter. Even if you wish to have an overview of a chapter, quick revision notes are here to do if for you. These notes will certainly save your time during stressful exam days.

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