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Magnetic Effects of Current and Magnetism MCQs for NEET — Physics Questions with Answers

Practice free Magnetic Effects of Current and Magnetism (Physics) NEET multiple-choice questions online with instant answers and detailed explanations. No login required.

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NEET 2024
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Match List-I with List-II.

List-I (Material) List-II (Susceptibility ($\chi$))
A. Diamagnetic I. $\chi = 0$
B. Ferromagnetic II. $0 > \chi \geq -1$
C. Paramagnetic III. $\chi \gg 1$
D. Non-magnetic IV. $0 < \chi < \varepsilon$ (a small positive number)

Choose the correct answer from the options given below:

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Explanation

Diamagnetic: $\chi$ slightly negative; Ferromagnetic: $\chi \gg 1$; Paramagnetic: small positive; Non-magnetic: $\chi = 0$.

NEET 2024
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In a uniform magnetic field of 0.049 T, a magnetic needle performs 20 complete oscillations in 5 seconds as shown. The moment of inertia of the needle is $9.8 \times 10^{-6}\ \text{kg m}^2$. If the magnitude of magnetic moment of the needle is $x \times 10^{-5}\ \text{Am}^2$; then the value of '$x$' is:

N S B
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Explanation

$T = 5/20 = 0.25$ s; $T = 2\pi\sqrt{I/MB}$ gives $M = 4\pi^2 I/(T^2 B) = 1280\pi^2 \times 10^{-5}$ Am².

NEET 2024
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A tightly wound 100 turns coil of radius 10 cm carries a current of 7 A. The magnitude of the magnetic field at the centre of the coil is (Take permeability of free space as $4\pi \times 10^{-7}$ SI units):

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Explanation

$B = \mu_0 N I/(2R) = 14\pi \times 10^{-4} \approx 4.4$ mT.

NEET 2024
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A sheet is placed on a horizontal surface in front of a strong magnetic pole. A force is needed to:

A. hold the sheet there if it is magnetic.

B. hold the sheet there if it is non-magnetic.

C. move the sheet away from the pole with uniform velocity if it is conducting.

D. move the sheet away from the pole with uniform velocity if it is both, non-conducting and non-polar.

Choose the correct statement(s) from the options given below:

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Explanation

Magnetic sheet attracted (A needs holding force); conducting sheet feels eddy-current drag (C needs pushing force).

NEET 2024
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An iron bar of length L has magnetic moment M. It is bent at the middle of its length such that the two arms make an angle $60^\circ$ with each other. The magnetic moment of this new magnet is:

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Explanation

Each half $= M/2$. With $60^\circ$ between arms, moment vectors are $120^\circ$ apart. Resultant $= 2(M/2)\cos 60^\circ = M/2$.

NEET 2025
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An electron (mass $9\times10^{-31}$ kg and charge $1.6\times10^{-19}$ C) moving with speed $c/100$ ($c$ = speed of light) is injected into a magnetic field $\vec{B}$ of magnitude $9\times10^{-4}$ T perpendicular to its direction of motion. We wish to apply a uniform electric field $\vec{E}$ together with the magnetic field so that the electron does not deflect from its path. Then ($c = 3\times10^8\ \text{ms}^{-1}$):

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Explanation

For zero deflection (velocity selector) the electric force must balance the magnetic force: $qE = qvB$ with $\vec{E}\perp\vec{B}$. $E = vB = \dfrac{c}{100}\times B = 3\times10^6\times 9\times10^{-4} = 2.7\times10^3 = 27\times10^2\ \text{V m}^{-1}$.

NEET 2025
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A 2 amp current is flowing through two different small circular copper coils having radii ratio 1:2. The ratio of their respective magnetic moments will be:

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Explanation

$M = I\pi r^2$ with the same $I$, so $\dfrac{M_1}{M_2} = \dfrac{r_1^2}{r_2^2} = \dfrac{1}{4}$.

NEET 2025
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A model for quantized motion of an electron in a uniform magnetic field $B$ states that the flux passing through the orbit of the electron is $n(h/e)$ where $n$ is an integer, $h$ is Planck's constant and $e$ is the magnitude of electron's charge. According to the model, the magnetic moment of an electron in its lowest energy state will be ($m$ is the mass of the electron):

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Explanation

Flux $B\pi r^2 = n\tfrac{h}{e}$; for $n=1$, $Br^2 = \dfrac{h}{\pi e}$. With $r = \dfrac{mv}{eB}$, $\mu = \tfrac12 evr = \dfrac{e^2Br^2}{2m} = \dfrac{e^2}{2m}\cdot\dfrac{h}{\pi e} = \dfrac{he}{2\pi m}$.

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