Induced EMF and Current NEET Questions

Physics - Electromagnetic Induction and Alternating Currents

Induced EMF and Current MCQ Questions


7.
In an AC generator, how many times per second does the current reverse its direction if operating at 50 Hz?
A.
10 times
B.
20 times
C.
60 times
D.
50 times
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ANSWER :
D. 50 times
8.
According to Faraday’s law, the magnitude of induced emf is proportional to

NEET - 2018

A.
Rate of change of electric flux
B.
Rate of change of magnetic flux
C.
Strength of the magnetic field
D.
Area of the coil
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ANSWER :
B. Rate of change of magnetic flux
9.
The SI unit of induced emf is

NEET - 2019

A.
Joule/second
B.
Weber
C.
Coulomb/second
D.
Volt
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ANSWER :
D. Volt
10.
What is the SI unit of magnetic flux?
A.
Weber
B.
Tesla
C.
Henry
D.
Farad
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ANSWER :
A. Weber
11.
The direction of induced current is such that it opposes the change producing it. This is explained by

NEET - 2021

A.
Lenz’s law
B.
Faraday’s first law
C.
Ampere’s circuital law
D.
Biot-Savart law
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ANSWER :
A. Lenz’s law
12.
According to Faraday’s law of electromagnetic induction, the induced EMF in a circuit is equal to:
A.
The rate of change of electric field
B.
The rate of change of magnetic flux
C.
The rate of change of current
D.
The rate of change of resistance
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ANSWER :
B. The rate of change of magnetic flux