Question 1

In case of inductor, energy is stored in the

Accepted Answer

magnetic field

Answer

gravitational field

Answer

electric field

Answer

potential field

Question 2

AC generator is based upon

Accepted Answer

Faraday's law of electromagnetic induction

Answer

Mutual induction

Answer

Lenz's law

Answer

Maxwell's equations

Question 3

If a coil is wound on an iron core, the magnetic flux in it

Accepted Answer

increases

Answer

decreases

Answer

becomes zero

Answer

stays the same

Question 4

With the increase in the speed of motor, the magnitude of back emf

Accepted Answer

increases

Answer

first increases then decreases

Answer

decreases

Answer

remains same

Question 5

The only difference in the construction of DC generator and AC motor is

Accepted Answer

commutator

Answer

carbon brushes

Answer

coil

Answer

magnetic field

Question 6

Motional emf is given by

Accepted Answer

vBL

Answer

qBL

Answer

eBL

Answer

IBL

Question 7

Lenz's law deals with

Accepted Answer

direction of induced current

Answer

magnitude of current

Answer

direction of emf

Answer

magnitude of emf

Question 8

If a  magnet and a coil are moving with the same speed, will any emf be induced in the coil?

Accepted Answer

no

Answer

yes

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