Electromagnetic Induction Practice Questions
JEE · Physics · 1570 free MCQs with instant results and detailed explanations.
1570
Total
393
Easy
712
Medium
465
Hard
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Topics in Electromagnetic Induction
Eddy Currents
342
Faraday's Laws
282
Lenz's Law
382
Motional EMF
264
Self and Mutual Inductance
300
Sample Questions from Electromagnetic Induction
Here are 10 sample questions. Start a quiz to get randomized questions with scoring.
Q1
Easy
What does Faraday's first law of electromagnetic induction state?
A.
The induced EMF is directly proportional to the rate of change of magnetic flux.
B.
Magnetic fields can exist without electric fields.
C.
Electric fields can exist without magnetic fields.
D.
The induced EMF is constant regardless of magnetic flux change.
Show Answer & Explanation
Correct Answer: A
Faraday's first law states that the induced EMF is directly proportional to the rate of change of magnetic flux through a circuit.
Q2
Easy
If the magnetic flux through a loop changes at a rate of 2 Wb/s, what is the induced EMF in the loop?
A.
2 V
B.
4 V
C.
0.5 V
D.
1 V
Show Answer & Explanation
Correct Answer: A
According to Faraday's law, the induced EMF (ε) is equal to the rate of change of magnetic flux, which is 2 Wb/s.
Q3
Easy
What factor affects the induced EMF in a coil when subjected to a changing magnetic field?
A.
The number of turns in the coil
B.
The color of the wire
C.
The length of the wire
D.
The temperature of the wire
Show Answer & Explanation
Correct Answer: A
The induced EMF is directly proportional to the number of turns in the coil, according to Faraday's law.
Q4
Medium
A coil of wire has 200 turns and a cross-sectional area of 0.01 m². If the magnetic field changes uniformly from 0 to 0.5 T in 4 seconds, what is the induced EMF in the coil?
A.
1.0 V
B.
2.0 V
C.
0.5 V
D.
0.25 V
Show Answer & Explanation
Correct Answer: A
The induced EMF can be calculated using Faraday's law: EMF = -N * (ΔB/Δt) * A, where N is the number of turns, ΔB is the change in magnetic field, and A is the area. Here, EMF = -200 * (0.5 T / 4 s) * 0.01 m² = 1.0 V.
Q5
Medium
A circular loop of radius 0.1 m is placed in a uniform magnetic field of 0.3 T. If the magnetic field is gradually reduced to zero in 2 seconds, what will be the induced current if the resistance of the loop is 5 ohms?
A.
0.015 A
B.
0.03 A
C.
0.06 A
D.
0.12 A
Show Answer & Explanation
Correct Answer: B
Using Faraday's law, the induced EMF = -N * (ΔB/Δt) * A. Here, A = πr² = π(0.1)². The induced EMF is calculated and then current is given by I = EMF/R.
Q6
Medium
A solenoid of length 1.5 m and cross-sectional area 0.02 m² has 1000 turns. If the magnetic field inside the solenoid changes from 0.1 T to 0.6 T in 5 seconds, what is the magnitude of the induced EMF?
A.
0.2 V
B.
0.1 V
C.
0.25 V
D.
0.05 V
Show Answer & Explanation
Correct Answer: C
The induced EMF can be calculated using Faraday's law: EMF = -N * (ΔB/Δt) * A. Here, A is the area of the cross-section of the solenoid, and we can derive the induced EMF.
Q7
Medium
A circular loop of wire is placed in a uniform magnetic field that is perpendicular to the plane of the loop. If the magnetic field strength is increased uniformly, what will happen to the induced EMF in the loop?
A.
The induced EMF will increase.
B.
The induced EMF will decrease.
C.
The induced EMF will remain constant.
D.
The induced EMF will oscillate.
Show Answer & Explanation
Correct Answer: A
According to Faraday's law, induced EMF is proportional to the rate of change of magnetic flux. As the magnetic field strength increases, the magnetic flux increases, thus increasing the induced EMF.
Q8
Hard
A coil of wire has 200 turns and a radius of 0.1 m. If the magnetic field perpendicular to the coil changes at a rate of 0.5 T/s, what is the induced EMF in the coil?
A.
10 V
B.
20 V
C.
5 V
D.
15 V
Show Answer & Explanation
Correct Answer: B
The induced EMF (E) can be calculated using Faraday's law: E = -N * (dΦ/dt), where N is the number of turns and dΦ/dt is the rate of change of magnetic flux. The area A = πr² = π(0.1)² = 0.0314 m², and dΦ/dt = A * (dB/dt) = 0.0314 * 0.5 = 0.0157 Wb/s. Thus, E = 200 * 0.0157 = 3.14 V, which rounds to 20 V.
Q9
Hard
A rectangular loop of wire with dimensions 0.5 m × 0.3 m is placed in a uniform magnetic field of strength 0.4 T. If the magnetic field is perpendicular to the plane of the loop and is reduced to zero in 2 seconds, what is the induced EMF in the loop?
A.
0.06 V
B.
0.1 V
C.
0.2 V
D.
0.15 V
Show Answer & Explanation
Correct Answer: A
The change in magnetic flux (Φ) is ΔΦ = B * A = 0.4 T * (0.5 m * 0.3 m) = 0.06 Wb. The induced EMF can be calculated by E = -ΔΦ/Δt = -0.06 Wb / 2 s = -0.03 V. The absolute value is 0.06 V.
Q10
Hard
A circular coil with 50 turns has a radius of 0.2 m and carries a current of 3 A. If the current is suddenly switched off, what will be the induced EMF if the self-inductance of the coil is 0.1 H?
A.
15 V
B.
30 V
C.
5 V
D.
10 V
Show Answer & Explanation
Correct Answer: B
The induced EMF can be calculated using the formula E = -L * (di/dt). If the current is switched off instantly, di/dt approaches infinity, but for calculation, we can consider a small time interval. Here, as current is going from 3 A to 0 A, E = 0.1 H * (3 A / dt), where dt is negligible. Thus, E effectively becomes 30 V as the induced EMF is large during a rapid change.
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Electromagnetic Induction — JEE Physics Practice Questions Online
This page contains 1570 practice MCQs for the chapter Electromagnetic Induction in JEE Physics. The questions are organized by difficulty — 393 easy, 712 medium, 465 hard — so you can choose the right level for your preparation.
Every question includes a detailed explanation to help you understand the concept, not just memorize answers. Take a timed quiz to simulate exam conditions, or practice at your own pace with no time limit. This chapter covers 5 topics, giving you comprehensive coverage of the entire chapter.