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JEE Main Physics Electromagnetic Induction Practice Questions

Question 1.

A square loop of side $15 cm$ being moved towards right at a constant speed of $2 cm / s$ as shown in figure. The front edge enters the $50 cm$ wide magnetic field at $t = 0$ . The value of induced emf in the loop at $t = 10 s$ will be :

JEE Main 2024 (Online) 9th April Evening Shift Physics - Electromagnetic Induction Question 4 English

zero

4.5 mV

0.3 mV

3 mV

Question 2.

In a coil, the current changes from $- 2 A$ to $+ 2 A$ in $0.2 s$ and induces an emf of $0.1 V$ . The self inductance of the coil is :

4 mH

2.5 mH

1 mH

5 mH

Question 3.

Two conducting circular loops A and B are placed in the same plane with their centres coinciding as shown in figure. The mutual inductance between them is:

JEE Main 2024 (Online) 5th April Morning Shift Physics - Electromagnetic Induction Question 3 English

\frac{μ_{o}}{2 π} \cdot \frac{b^{2}}{a}

\frac{μ_{o} π a^{2}}{2 b}

\frac{μ_{0} π b^{2}}{2 a}

\frac{μ_{0}}{2 π} \cdot \frac{a^{2}}{b}

Question 4.

A transformer has an efficiency of

80 %

and works at

10 V

and

4 kW

. If the secondary voltage is

240 V

, then the current in the secondary coil is :

1.33 A

13.33 A

1.59 A

15.1 A

Question 5.

A coil is places perpendicular to a magnetic field of $5000 T$ . When the field is changed to $3000 T$ in $2 s$ , an induced emf of $22 V$ is produced in the coil. If the diameter of the coil is $0.02 m$ , then the number of turns in the coil is:

140

Question 6.

Match List I with List II

	List I		List II
(A)	Gauss's law of magnetostatics	(I)	$\oint \vec{E} \cdot \vec{d} a = \frac{1}{ε_{0}} \int ρ d V$
(B)	Faraday's law of electro magnetic induction	(II)	$\oint \vec{B} \cdot \vec{d} a = 0$
(C)	Ampere's law	(III)	$\int \vec{E} \cdot \vec{d} l = \frac{- d}{d t} \int \vec{B} \cdot \vec{d} a$
(D)	Gauss's law of electrostatics	(IV)	$\oint \vec{B} \cdot \vec{d} l = μ_{0} I$

Choose the correct answer from the options given below:

A-III, B-IV, C-I, D-II

A-IV, B-II, C-III, D-I

A-II, B-III, C-IV, D-I

A-I, B-III, C-IV, D-II

Question 7.

Match List I with List II

	List - I		List - II
(A)	$\oint \vec{B} \cdot \vec{d l} = μ_{o} i_{c} + μ_{o} ε_{o} \frac{d ϕ_{E}}{d t}$	(I)	Gauss' law for electricity
(B)	$\oint \vec{E} \cdot \vec{d l} = \frac{d ϕ_{B}}{d t}$	(II)	Gauss' law for magnetism
(C)	$\oint \vec{E} \cdot \vec{d A} = \frac{Q}{ε_{o}}$	(III)	Faraday law
(D)	$\oint \vec{B} \cdot \vec{d A} = 0$	(IV)	Ampere - Maxwell law

Choose the correct answer from the options given below:

A-IV, B-III, C-I, D-II

A-I, B-II, C-III, D-IV

A-IV, B-I, C-III, D-II

A-II, B-III, C-I, D-IV

Question 8.

A rectangular loop of length $2.5 m$ and width $2 m$ is placed at $60^{\circ}$ to a magnetic field of $4 T$ . The loop is removed from the field in $10 \sec$ . The average emf induced in the loop during this time is

- 2 V

+ 2 V

+ 1 V

- 1 V

Question 9.

12 V

battery connected to a coil of resistance

6 Ω

through a switch, drives a constant current in the circuit. The switch is opened in

1 ms

. The emf induced across the coil is

20 V

. The inductance of the coil is :

5 mH

8 mH

10 mH

12 mH

Question 10.

Given below are two statements: one is labelled as Assertion $A$ and the other is labelled as Reason $R$

Assertion A: A bar magnet dropped through a metallic cylindrical pipe takes more time to come down compared to a non-magnetic bar with same geometry and mass.

Reason R: For the magnetic bar, Eddy currents are produced in the metallic pipe which oppose the motion of the magnetic bar.

In the light of the above statements, choose the correct answer from the options given below

A is true but R is false

A is false but R is true

Both A and R are true but R is NOT the correct explanation of A

Both A and R are true and R is the correct explanation of A

Question 1.

Given below are two statements:

Statement I : If the number of turns in the coil of a moving coil galvanometer is doubled then the current sensitivity becomes double.

Statement II : Increasing current sensitivity of a moving coil galvanometer by only increasing the number of turns in the coil will also increase its voltage sensitivity in the same ratio

In the light of the above statements, choose the correct answer from the options given below :

Statement I is true but Statement II is false

Statement I is false but Statement II is true

Both Statement I and Statement II are false

Both Statement I and Statement II are true

Question 2.

An emf of $0.08 V$ is induced in a metal rod of length $10 cm$ held normal to a uniform magnetic field of $0.4 T$ , when moves with a velocity of:

20 {ms}^{- 1}

2 {ms}^{- 1}

3.2 {ms}^{- 1}

0.5 {ms}^{- 1}

Question 3.

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

to bring the coil to rest quickly

to produce large deflecting torque on the coil

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

to make the magnetic field radial

Question 4.

The induced emf can be produced in a coil by

A. moving the coil with uniform speed inside uniform magnetic field

B. moving the coil with non uniform speed inside uniform magnetic field

C. rotating the coil inside the uniform magnetic field

D. changing the area of the coil inside the uniform magnetic field

Choose the correct answer from the options given below:

A and C only

C and D only

B and D only

B and C only

Question 5.

A coil is placed in magnetic field such that plane of coil is perpendicular to the direction of magnetic field. The magnetic flux through a coil can be changed :

A. By changing the magnitude of the magnetic field within the coil.

B. By changing the area of coil within the magnetic field.

C. By changing the angle between the direction of magnetic field and the plane of the coil.

D. By reversing the magnetic field direction abruptly without changing its magnitude.

Choose the most appropriate answer from the options given below :

A, B and D only

A, B and C only

A and B only

A and C only

Question 6.

Spherical insulating ball and a spherical metallic ball of same size and mass are dropped from the same height. Choose the correct statement out of the following

{Assume negligible air friction}

Metal ball will reach the earth's surface earlier than the insulating ball

Both will reach the earth's surface simultaneously.

Insulating ball will reach the earth's surface earlier than the metal ball

Time taken by them to reach the earth's surface will be independent of the properties of their materials

Question 7.

A square loop of area 25 cm $^{2}$ has a resistance of 10 $Ω$ . The loop is placed in uniform magnetic field of magnitude 40.0 T. The plane of loop is perpendicular to the magnetic field. The work done in pulling the loop out of the magnetic field slowly and uniformly in 1.0 sec, will be

1.0 \times 10^{- 3} J

5 \times 10^{- 3} J

2.5 \times 10^{- 3} J

1.0 \times 10^{- 4} J

Question 8.

Find the mutual inductance in the arrangement, when a small circular loop of wire of radius ' $R$ ' is placed inside a large square loop of wire of side $L$ $(L ≫ R)$ . The loops are coplanar and their centres coincide :

JEE Main 2023 (Online) 29th January Morning Shift Physics - Electromagnetic Induction Question 36 English

M = \frac{\sqrt{2} μ_{0} R}{L^{2}}

M = \frac{2 \sqrt{2} μ_{0} R}{L^{2}}

M = \frac{2 \sqrt{2} μ_{0} R^{2}}{L}

M = \frac{\sqrt{2} μ_{0} R^{2}}{L}

Question 9.

A wire of length 1m moving with velocity 8 m/s at right angles to a magnetic field of 2T. The magnitude of induced emf, between the ends of wire will be __________.

20 V

8 V

16 V

12 V

Question 10.

A metallic rod of length 'L' is rotated with an angular speed of ' $ω$ ' normal to a uniform magnetic field 'B' about an axis passing through one end of rod as shown in figure. The induced emf will be :

JEE Main 2023 (Online) 24th January Evening Shift Physics - Electromagnetic Induction Question 33 English

\frac{1}{2} B^{2} L^{2} ω

\frac{1}{2} {BL}^{2} ω

\frac{1}{4} {BL}^{2} ω

\frac{1}{4} B^{2} L ω

JEE Main Electromagnetic Induction Practice Questions With Solutions

JEE Main Physics Electromagnetic Induction Practice Questions

Question 1.

Question 2.

Question 3.

Question 4.

Question 5.

Question 6.

Question 7.

Question 8.

Question 9.

Question 10.

Question 1.

Question 2.

Question 3.

Question 4.

Question 5.

Question 6.

Question 7.

Question 8.

Question 9.

Question 10.

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