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#1 Class Class 12 Physics Moving Charges and Magnetism 2020 Short 3M

Calculate the magnetic field due to a circular coil of 500 turns and diameter 0.1 m, carrying a current of 7 A:
(A) At a point on the axis at distance 0.12 m from centre
(B) At the centre of the coil. ($\mu_0 = 4\pi \times 10^{-7}$ T·m/A)

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#2 Class Class 12 Physics Moving Charges and Magnetism 2021 Short 2M

Two very long straight insulated wires are kept at 90° to each other in the xy-plane. Both wires carry equal magnitude of current $I$ in directions shown in the figure. What is the net magnetic field at the origin?

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#3 Class Class 12 Physics Moving Charges and Magnetism 2023 Short 3M

Find the magnitude of the magnetic field at the centre of an equilateral triangular loop of side 1 m carrying a current of 10 A. ($\mu_0 = 4\pi \times 10^{-7}$ N A$^{-2}$)

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#4 Class Class 12 Physics Moving Charges and Magnetism 2022 Short 5M

Use Biot-Savart law to obtain an expression for the magnetic field at the centre of a coil bent in the form of a square of side $2a$ carrying current $I$.

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#5 Class Class 12 Physics Moving Charges and Magnetism 2021 Short 3M

From the figure shown, find the magnetic field at point P if $i = 10$ A, $a = 70$ cm, $\phi_1 = 37°$ and $\phi_2 = 53°$.

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#6 Class Class 12 Physics Moving Charges and Magnetism 2018 Short 1M

Write the expression for Biot-Savart's law.

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#7 Class Class 12 Physics Moving Charges and Magnetism 2020 Short 2M

Write an expression for the maximum kinetic energy acquired by charged particles accelerated by a cyclotron.

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#8 Class Class 12 Physics Moving Charges and Magnetism 2019 Short 2M

A magnetic field that varies in magnitude from point to point but has a constant direction (east to west) is set up in a chamber. A charged particle enters the chamber and travels undeflected along a straight path with constant speed. What can you say about the direction of initial velocity of the particle?

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#9 Class Class 12 Physics Moving Charges and Magnetism 2021 Short 2M

Two particles A and B of masses $m$ and $2m$ have charges $q$ and $2q$ respectively. They move with velocities $v_1$ and $v_2$ in the same direction in the same magnetic field $B$ acting normally. If the forces $F_A$ and $F_B$ are in the ratio 1:2, find the ratio $v_1 : v_2$.

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#10 Class Class 12 Physics Moving Charges and Magnetism 2022 Short 5M

A long straight wire of circular cross-section of radius $a$ carries steady current $I$ uniformly distributed across its cross-section. Using Ampere's law, calculate the magnetic field for: (a) $r <a> a$ (outside).

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#11 Class Class 12 Physics Moving Charges and Magnetism 2020 Mcq 1M

An electron is moving along positive x-axis in a magnetic field which is parallel to the positive y-axis. In what direction will the magnetic force act on the electron?

A. Along $-x$ axis

B. Along $-z$ axis

C. Along $+z$ axis

D. Along $-y$ axis

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#12 Class Class 12 Physics Moving Charges and Magnetism 2022 Short 3M

A proton is moving with speed $2 \times 10^5$ m/s and enters a uniform magnetic field $B = 1.5$ T. The velocity makes an angle of 30° with $\vec{B}$. Calculate: (a) the pitch of the helical path, (b) kinetic energy after completing half the circle.

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#13 Class Class 12 Physics Moving Charges and Magnetism 2023 Long 5M

Two identical charged particles P and Q, each of mass $4 \times 10^{-26}$ kg and charge $4.8 \times 10^{-19}$ C, move with speed $2.4 \times 10^5$ m/s. They are equidistant (0.5 m) from the Y-axis. A magnetic field $B$ is switched on so that the two particles undergo head-on collision. Find: (I) the direction of $B$, and (II) the magnitude of $B$.

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#14 Class Class 12 Physics Moving Charges and Magnetism 2021 Mcq 1M

A long straight wire of circular cross-section of radius $a$ carries a steady current $I$ uniformly distributed across its cross-section. The ratio of magnitudes of magnetic field at a point $a/2$ above the surface to that at a point $a/2$ below its surface is

A. 04:01

B. 01:01

C. 04:03

D. 03:04

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#15 Class Class 12 Physics Moving Charges and Magnetism 2022 Long 5M

(A) State the working principle of a moving coil galvanometer. What modification is required to make its scale linear?
(B) A galvanometer of resistance 49.5 $\Omega$ has a range of 0.05 A. Find the resistance needed to convert it to an ammeter of range 5 A.
(C) How should these resistors be connected to the galvanometer in each case?

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#16 Class Class 12 Physics Moving Charges and Magnetism 2023 Long 5M

A point-sized object having charge 1 C and mass 1 g is projected with velocity $2\hat{i}$ m/s from point $(0, 2\text{ cm}, 0)$ in a magnetic field $\vec{B} = -0.1\hat{k}$ T in the first quadrant.
(A) What will be the shape of the path?
(B) At what point will it cross the X-axis?
(C) What will be the kinetic energy of the particle when it enters the fourth quadrant?

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#17 Class Class 12 Physics Moving Charges and Magnetism 2020 Short 2M

Write an expression for the magnetic force per unit length between two parallel thin current-carrying wires. Hence define one ampere.

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#18 Class Class 12 Physics Moving Charges and Magnetism 2022 Mcq 1M

A charged particle is projected along the axis of a current-carrying loop. Which of the following statements is true?

A. The acceleration depends on the velocity of projection

B. The acceleration depends on the magnitude of current in the coil

C. The acceleration depends on the radius of the coil

D. The charged particle will move with constant velocity

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#19 Class Class 12 Physics Moving Charges and Magnetism 2019 Short 2M

A long solenoid has 800 turns per metre length. A current of 1.6 A flows through it. Calculate the magnetic field induction at the end of the solenoid on its axis. ($\mu_0 = 4\pi \times 10^{-7}$ T·m/A)

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#20 Class Class 12 Physics Moving Charges and Magnetism 2018 Mcq 1M

A current-carrying loop is placed in a uniform magnetic field. The torque acting on it does NOT depend upon

A. area of loop

B. shape of loop

C. number of turns in loop

D. strength of current and magnetic field

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