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Electromagnetic Induction

6 NEET Physics previous year questions on Electromagnetic Induction — options free on every question; 1 include the answer & explanation free, the rest unlock with PYQ Pass.

Q1 FREE PREVIEW

Two conducting circular loops of radii \( R_{1} \) and \( R_{2} \) are placed in the same plane with their centres coinciding. If \( R_{1}>R_{2} \), the mutual inductance \( M \) between them will be directly proportional to

[NEET 2021]

a

\( \frac{R_{1}}{R_{2}} \)

b

\( \frac{R_{2}}{R_{1}} \)

c

\( \frac{R_{1}^{2}}{R_{2}} \)

d

\( \frac{R_{2}^{2}}{R_{1}} \)

✓ Correct answer: d)

\( \frac{R_{2}^{2}}{R_{1}} \)

Explanation

Magnetic field due to R1 at the center

\(B=\frac{{\mu }_{0}i}{2{R}_{1}}\)

Flux linked with R2

\(ϕ=B{A}_{2}=\frac{{\mu }_{0}i}{2{R}_{1}}\times \pi {R}_{2}^{2}=Mi\)

\(M=\frac{{\mu }_{0}\pi {R}_{2}^{2}}{2{R}_{1}}\)

\(M\propto \frac{{R}_{2}^{2}}{{R}_{1}}\)

(NEW NCERT 12th Page No. 164, 165, 166, 167, 168 and 169)

Q2

A wheel with 20 metallic spokes each \( 1 \mathrm{~m} \) long is rotated with a speed of 120 rpm in a plane perpendicular to a magnetic field of \( 0.4 \mathrm{G} \). The induced emf between the axle and rim of the wheel will be. \((1G={10}^{-4}T)\)

a

\( 2.51 \times 10^{-5} \mathrm{~V} \)

b

\( 4.0 \times 10^{-5} \mathrm{~V} \)

c

\( 2.51 \mathrm{~V} \)

d

\( 2.51 \times 10^{-4} \mathrm{~V} \)

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Q3

The magnetic energy stored in an inductor of inductance \(4\mu \mathrm{H}\) carrying a current of \(2\mathrm{A}\) is :

[NEET 2023]

a

\(4\mathrm{mJ}\)

b

\(8\mathrm{mJ}\)

c

\(8\mu \mathrm{J}\)

d

\(4\mu \mathrm{J}\)

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Q4

The magnetic flux linked with a coil (in Wb) is given by the equation \( \phi=5 \mathrm{t}^{2}+3 \mathrm{t}+16 \). The magnitude of induced emf in the coil at the fourth second will be:

[Re-NEET 2020]

a

\( 43 \mathrm{~V} \)

b

\( 108 \mathrm{~V} \)

c

\( 10 \mathrm{~V} \)

d

\( 33 \mathrm{~V} \)

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Q5

The net magnetic flux through any closed surface is :

[NEET 2023]

a

Positive

b

Infinity

c

Negative

d

Zero

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Q6

Certain galvanometers have a fixed core made of non magnetic metallic material. The function of this metallic material is

[JEE Main 2023, 8 Apr (Shift 1)]

a

to oscillate the coil in magnetic field for longer period of time

b

to bring the coil to rest quickly

c

to produce large deflecting torque on the coil

d

to make the magnetic field radial

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