Electromagnetic Induction and AC Practice Questions
NEET · Physics · 1627 free MCQs with instant results and detailed explanations.
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Total
393
Easy
739
Medium
495
Hard
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Topics in Electromagnetic Induction and AC
Transformers
306
LCR Circuit
265
Lenz's Law
305
AC Circuits
255
Self and Mutual Inductance
262
Faraday's Laws
234
Sample Questions from Electromagnetic Induction and AC
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Q1
Easy
What does Faraday's first law of electromagnetic induction state?
A.
The induced electromotive force (emf) is directly proportional to the rate of change of magnetic flux.
B.
The induced current is always equal to the applied current.
C.
Magnetic fields do not affect electric charges.
D.
Electric fields cannot induce magnetic fields.
Show Answer & Explanation
Correct Answer: A
Faraday's first law states that the induced emf in a circuit is directly proportional to the rate of change of magnetic flux through the circuit, which is a fundamental principle of electromagnetic induction.
Q2
Easy
Which of the following devices operates on the principle of electromagnetic induction?
A.
Transformer
B.
Resistor
C.
Capacitor
D.
Inductor
Show Answer & Explanation
Correct Answer: A
A transformer operates on the principle of electromagnetic induction, where varying currents in one coil induce voltages in another coil. Other options do not operate on this principle.
Q3
Easy
When the magnetic field through a loop of wire is increased, what is the direction of the induced current according to Lenz's law?
A.
In the same direction as the magnetic field
B.
In the opposite direction of the magnetic field
C.
Clockwise only
D.
Counterclockwise only
Show Answer & Explanation
Correct Answer: B
According to Lenz's law, the induced current will flow in a direction that opposes the change in magnetic flux through the loop. Therefore, if the magnetic field is increasing, the induced current will flow in the opposite direction.
Q4
Medium
What is the key principle of Faraday's law of electromagnetic induction?
A.
A current changes in a circuit induce a magnetic field.
B.
A changing magnetic field induces an electromotive force (EMF) in a circuit.
C.
A constant magnetic field induces a current in a stationary loop.
D.
An induced current opposes the change in magnetic field.
Show Answer & Explanation
Correct Answer: B
Faraday's law states that a changing magnetic field induces an EMF in a circuit, which is the core principle of electromagnetic induction.
Q5
Medium
Which of the following statements regarding Lenz's law is true?
A.
An induced current always flows in the same direction as the change in magnetic field.
B.
An induced current opposes the change in magnetic field that created it.
C.
Lenz's law applies only to alternating currents.
D.
Lenz's law has no relation to Faraday's law.
Show Answer & Explanation
Correct Answer: B
Lenz's law states that the direction of induced current is such that it opposes the change in magnetic flux, ensuring conservation of energy.
Q6
Medium
If a coil is rotated in a magnetic field, which of the following factors affects the magnitude of the induced EMF?
A.
The speed of rotation.
B.
The strength of the magnetic field.
C.
The number of turns in the coil.
D.
All of the above.
Show Answer & Explanation
Correct Answer: D
All these factors affect the induced EMF according to Faraday's law. Increasing any of them will increase the induced EMF.
Q7
Medium
A transformer has 100 turns in the primary coil and 50 turns in the secondary coil. If the input voltage is 220 V, what is the output voltage?
A.
110 V
B.
220 V
C.
330 V
D.
440 V
Show Answer & Explanation
Correct Answer: A
The transformer equation states Vp/Vs = Np/Ns, thus Vs = Vp * (Ns/Np) = 220 V * (50/100) = 110 V.
Q8
Hard
If the magnetic flux through a loop changes from 5 Wb to 2 Wb in 3 seconds, what is the average induced EMF in the loop?
A.
1 V
B.
0.5 V
C.
1.5 V
D.
0.3 V
Show Answer & Explanation
Correct Answer: A
The average induced EMF (ε) can be calculated using Faraday's Law: ε = -ΔΦ/Δt. Here, ΔΦ = 2 Wb - 5 Wb = -3 Wb, and Δt = 3 seconds. So, ε = -(-3)/3 = 1 V.
Q9
Hard
A solenoid with 200 turns and a length of 0.5 m is carrying a current of 3 A. If the magnetic field inside the solenoid is uniform, what is the magnetic field strength?
A.
0.6 T
B.
0.4 T
C.
0.3 T
D.
0.5 T
Show Answer & Explanation
Correct Answer: D
The magnetic field inside a solenoid is given by B = μ₀ * (N/L) * I, where μ₀ = 4π x 10^-7 T m/A. Substituting values, B = (4π x 10^-7) * (200/0.5) * 3 = 0.5 T.
Q10
Hard
If a circular coil of radius 0.1 m has 50 turns and the magnetic field changes from 0.2 T to 0.5 T in 4 seconds, calculate the induced EMF.
A.
0.15 V
B.
0.25 V
C.
0.35 V
D.
0.45 V
Show Answer & Explanation
Correct Answer: B
Using Faraday's law, the induced EMF is given by ε = N * (ΔB/Δt) * A, where A = πr² = π(0.1)². So, A = 0.01π m². Thus, ε = 50 * (0.5 - 0.2)/4 * (0.01π) = 0.25 V.
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Electromagnetic Induction and AC — NEET Physics Practice Questions Online
This page contains 1627 practice MCQs for the chapter Electromagnetic Induction and AC in NEET Physics. The questions are organized by difficulty — 393 easy, 739 medium, 495 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 6 topics, giving you comprehensive coverage of the entire chapter.