Question

Which of the following is/are TRUE?

a. Faraday’s law of electromagnetic induction states that the induced emf or current in a circuit is directly proportional to the time rate of change of the magnetic flux in the circuit

b. There is induced emf or current in a circuit of the magnetic field in the circuit is very high

c. There is induced emf or current in a circuit if the area of the circuit is not too big

d. There is induced emf or current in a circuit if the circuit is rotated in a constant magnetic field

e. When the current in a circuit is changing with time, emf or current can be induced in another circuit nearby

Answer 1

a. True (Faraday's law)

b. False (induced emf depends on the rate of change of magnetic flux, current won't be induced in the circuit if magnetic flux through it is not changing)

c. False (it doesn't matter if the are of the circuit is large or small, emf won't be induced if flux through the circuit is not changing)

d. False (based on Faraday's law)

e. True, since current is changing, magnetic field produced by this current will be changing and so will magnetic flux and as per Faraday's changing magnetic flux will induced electric current in the circuit.