Question 1: Palette 1/32

NEET 2026 MCQ

A rectangular wire loop of sides 8 cm and 3 cm with a small cut, is moving out of a region of uniform magnetic field of magnitude 0.3 T directed normal to the plane of the loop. The emf developed across the cut, if the velocity of the loop is $2 \mathrm{~cm} \mathrm{~s}^{-1}$, in a direction normal to the shorter side of the loop, will be :

A

$4.8 \times 10^{-4}$ volt

B

$1.2 \times 10^{-4}$ volt

C

$1.3 \times 10^{-4}$ volt

D

$1.8 \times 10^{-4}$ volt

Question 2: Palette 2/32

NEET 2026 MCQ

Consider a long solenoid of length $I$ and radius $r$. If $n$ is the number of turns per unit length and $\mu_0$ is the permeability of free space, the inductance of the solenoid is :

A

$2 \mu_0 \pi n^2 r^2 I$

B

$\mu 0 \pi n^2 r^2 1$

C

$\mu_0 n^2 r^2 I$

D

$\left(\mu_0 / 2 \pi\right) n^2 r^2 I$

Question 3: Palette 3/32

NEET 2026 MCQ

Two identical inductors are connected in two different configurations $P$ and $Q$, where a time varying current $l(t)$ is flowing, as shown in the figure. The induced emf between points $a$ and $b$ for configuration $P$ is $E_P$ and that for configuration $Q$ is $E_Q$. The ratio $E_P / E_Q$ is:

[Neglect the effect of mutual inductance.]

A

2

B

$\frac{1}{4}$

C

$\frac{1}{2}$

D

1

Question 4: Palette 4/32

NEET 2026 MCQ

A conducting loop of finite resistance lies on the $x-y$ plane. There is a constant magnetic field in the $z$ direction. The area of the loop varies with time $t$, as $A=A_0(1+\sin t)$ in appropriate units. The figure that correctly indicates the qualitative behaviour of the power $P$ dissipated in the loop as a function of time is:

A

B

C

D

Question 5: Palette 5/32

NEET 2025 MCQ

$A B$ is a part of an electrical circuit (see figure). The potential difference " $V_A-V_B$ ", at the instant when current $i=2 \mathrm{~A}$ and is increasing at a rate of $1 \mathrm{amp} /$ second is:

A

9 volt

B

10 volt

C

5 volt

D

6 volt

Question 6: Palette 6/32

NEET 2024 MCQ

Let us consider two solenoids $A$ and $B$, made from same magnetic material of relative permeability $\mu_r$ and equal area of cross-section. Length of $A$ is twice that of $B$ and the number of turns per unit length in $A$ is half that of $B$. The ratio of self inductances of the two solenoids, $L_A: L_B$ is

A

$1: 2$

B

$2: 1$

C

$8: 1$

D

$1: 8$

Question 7: Palette 7/32

NEET 2023 MCQ

An emf is generated by an ac generator having 100 turn coil, of loop area $1 \mathrm{~m}^2$. The coil rotates at a speed of one revolution per second and placed in a uniform magnetic field of $0.05 \mathrm{~T}$ perpendicular to the axis of rotation of the coil. The maximum value of emf is :-

A

3.14 V

B

31.4 V

C

62.8 V

D

6.28 V

Question 8: Palette 8/32

NEET 2023 MCQ

The net magnetic flux through any closed surface is :

A

Positive

B

Infinity

C

Negative

D

Zero

Question 9: Palette 9/32

NEET 2022 MCQ

The magnetic flux linked to a circular coil of radius R is

$\phi = 2{t^3} + 4{t^2} + 2t + 5$ Wb

The magnitude of induced emf in the coil at t = 5 s is

A

192 V

B

108 V

C

197 V

D

150 V

Question 10: Palette 10/32

NEET 2022 MCQ

A square loop of side 1 m and resistance 1 $\Omega$ is placed in a magnetic field of 0.5 T. If the plane of loop is perpendicular to the direction of magnetic field, the magnetic flux through the loop is

A

2 weber

B

0.5 weber

C

1 weber

D

Zero weber

Question 11: Palette 11/32

NEET 2021 MCQ

Two conducting circular loops of radii R₁ and R₂ are placed in the same plane with their centres coinciding. If R₁ >> R₂, the mutual inductance M between them will be directly proportional to :

A

${{R_2^2} \over {{R_1}}}$

B

${{{R_1}} \over {{R_2}}}$

C

${{{R_2}} \over {{R_1}}}$

D

${{R_1^2} \over {{R_2}}}$

Question 12: Palette 12/32

NEET 2019 MCQ

A 800 turn coil of effective area 0.05 m² is kept. perpendicular to a magnetic filed 5 × 10^–5 T. When the plane of the coil is rotated by 90^o around any of its coplanar axis in 0.1 s, the emf induced in the coil will be :

A

0.2 V

B

0.02 V

C

2 V

D

2 $ \times $ 10^-3 V

Question 13: Palette 13/32

NEET 2019 MCQ

In which of the following devices, the eddy current effect is not used?

A

magnetic braking in train

B

electromagnet

C

electric heater

D

induction furnace

Question 14: Palette 14/32

NEET 2017 MCQ

A long solenoid of diameter 0.1 m has 2 $ \times $ 10⁴ turns per meter. At the centre of the solenoid, a coil of 100 turns and radius 0.01 m is placed with its axis coinciding with the solenoid axis. The current in the solenoid reduces at a constant rate to 0 A from 4 A in 0.05 s. If the resistance of the coil is 10 $\pi $² $\Omega $, the total charge flowing through the coil during this time is

A

16 $\mu $C

B

32 $\mu $C

C

16$\pi $ $\mu $C

D

32$\pi $ $\mu $C

Question 15: Palette 15/32

NEET 2016 MCQ

A uniform magnetic field is restricted within a region of rafius r. The magnetic field changes with time at a rate ${{d\overrightarrow B } \over {dt}}$. Loop 1 of radius R > r encloses the region r and loop 2 of radius R is outside the region of magnetic field as shown in the figure. Then the e.m.f. generated is

A

zero in loop 1 and zero in loop 2

B

$ - {{d\overrightarrow B } \over {dt}}\pi {r^2}$ in loop 1 and $ - {{d\overrightarrow B } \over {dt}}\pi {r^2}$ in loop 2

C

$ - {{d\overrightarrow B } \over {dt}}\pi {R^2}$ in loop 1 and zero in loop 2

D

$ - {{d\overrightarrow B } \over {dt}}\pi {r^2}$ in loop 1 and zero in loop 2

Question 16: Palette 16/32

NEET 2016 MCQ

A long solenoid has 1000 turns. When a current of 4 A flows through it, the magnetic flux linked with each turn of the solenoid is 4 $ \times \,{10^{ - 3}}$ Wb. The self-inductance of the solenoid is

A

2 H

B

1 H

C

4 H

D

3 H

Question 17: Palette 17/32

NEET 2015 MCQ

An electron moves on a straight line path XY as shown. The abcd is a coil adjacent to the path of electron. What will be the direction of current, if any, induced in the coil ?

A

The current will reverse its direction as the electron goes past the coil

B

No current induced

C

abcd

D

adcb

Question 18: Palette 18/32

NEET 2014 MCQ

A thin semicircular conducting ring (PQR) of radius r is falling with its plane vertical in a horizontal magnetic field B, as shown in the figure.


The potential difference developed across the ring when its speed is $v$, is

A

zero

B

${{Bv\pi {r^2}} \over 2}$ and P is at higher potential

C

$\pi rBV$ and R is at higher potential

D

2rBV and R is at higher potential

Question 19: Palette 19/32

NEET 2013 MCQ

A current of 2.5 A flows through a coil of inductance 5 H. The magnetic flux linked with the coil is

A

0.5 Wb

B

12.5 Wb

C

zero

D

2 Wb

Question 20: Palette 20/32

NEET 2013 MCQ

A wire loop is rotated in a magnetic field. The frequency of change of direction of the induced e.m.f. is

A

four times per revoluation

B

six times per revolution

C

once per revolution

D

twice per revolution

Question 21: Palette 21/32

NEET 2012 MCQ

In a coil of resistance 10 $\Omega $, the induced current developed by changing magnetic flux through it, is shown in figure as a function of time. The magnitude of change in flux through the coil in weber is

A

8

B

2

C

6

D

4

Question 22: Palette 22/32

NEET 2012 MCQ

A coil of resistance 400 $\Omega $ is placed in a magnetic field. If the magnetic flux $\phi $ (Wb) linked with the coil varies with time t (sec) as $\phi = 50{t^2} + 4$.

The current in the coil at t = 2 sec is

A

0.5 A

B

0.1 A

C

2 A

D

1 A

Question 23: Palette 23/32

NEET 2011 MCQ

The current $i$ in a coil varies with time as shown in the figure. The variation of induced emf with time would be

A

B

C

D

Question 24: Palette 24/32

NEET 2010 MCQ

A conducting circular loop is placed in a uniform magnetic field, B = 0.025 T with its plane perpendicular to the loop. The radius of the loop is made to shrink at a constant rate of 1 mm s^$-$1. The induced emf when the radius is 2 cm, is

A

$2\pi \mu V$

B

$\pi \mu V$

C

${\pi \over 2}\mu V$

D

2$\mu $$V$

Question 25: Palette 25/32

NEET 2009 MCQ

A conducting circular loop is placed in a uniform magnetic field 0.04 T with its plane perpendicular to the magnetic field. The radius of the loop starts shrinking at 2 mm/s. The induced emf in the loop when the radius is 2 cm is

A

4.8$\pi $$\mu $V

B

0.8$\pi $$\mu $V

C

1.6$\pi $$\mu $V

D

3.2$\pi $$\mu $V

Question 26: Palette 26/32

NEET 2009 MCQ

A rectangular, a square, a circular and an elliptical loop, all in the (x-y) plane, are moving out of a uniform magnetic field with a constant velocity. $\overrightarrow V = v\widehat i$. The magnetic field is directed along the negative z axis direction. The induced emf, during the passes of these loops, out of the field region, will not remain constant for

A

The circular and the elliptical loops

B

only the ellliptical loop

C

any of the four loops

D

the rectangular, circular and elliptical loops

Question 27: Palette 27/32

NEET 2008 MCQ

A long solenoid has 500 turns. When a current of 2 ampere is passed through it, the resulting magnetic flux linked with each turn of the solenoid is 4 $ \times $ 10^$-$3 Wb. The self-inductance of the solenoid is

A

1.0 henry

B

4.0 henry

C

2.5 henry

D

2.0 henry

Question 28: Palette 28/32

NEET 2008 MCQ

A circular disc of radius 0.2 meter is placed in a uniform magnetic field of induction ${1 \over \pi }\left( {{{Wb} \over {{m^2}}}} \right)$ in such a way that its axis makes an angle of 60^o with $\overrightarrow B .$ The magnetic flux linked with the disc is

A

0.08 Wb

B

0.01 Wb

C

0.02 Wb

D

0.06 Wb

Question 29: Palette 29/32

NEET 2006 MCQ

Two coils of self inductance 2 mH and 8 mH are placed so close together that the effective flux in one coil is completely linked with the other. The mutual inductance between these coils is

A

16 mH

B

10 mH

C

6 mH

D

4 mH

Question 30: Palette 30/32

NEET 2005 MCQ

As a result of change in the magnetic flux linked to the closed loop as shown in the figure, an e.m.f. $V$ volt is induced in the loop. The work done (joule) in taking a charge Q coulomb once along the loop is

A

QV

B

2QV

C

QV/2

D

zero

Question 31: Palette 31/32

NEET 2004 MCQ

The magnetic flux through a circuit of resistance R changes by an amount $\Delta $$\phi $ in a time $\Delta $t. Then the total quantity of electric charge Q that passes any point in the circuit during the time $\Delta $t is represented by

A

$Q = {1 \over R}.{{\Delta \phi } \over {\Delta t}}$

B

$Q = {{\Delta \phi } \over R}$

C

$Q = {{\Delta \phi } \over {\Delta t}}$

D

$Q = R.{{\Delta \phi } \over {\Delta t}}$

Question 32: Palette 32/32

NEET 2001 MCQ

For a coil having L = 2 mH, current flow through it is $I = {t^2}{e^{ - t}}$ then, the time at which emf become zero

A

2 sec

B

1 sec

C

4 sec

D

3 sec