Chapter: Electromagnetic Induction
1.

E.M.F can be induced in a circuit by

A. changing magnetic flux density
B. changing area of circuit
C. changing the angle
D. all of above
Answer» D. all of above
2.

A straight wire of length 0.20 m moves at a steady speed of {{}} 3.0 m s-1 at right angles to the magnetic field of flux density 0.10 T. The e.m.f induced across ends of wire is

A. 0.5 V
B. 0.06 V
C. 0.05 V
D. 0.04 V
Answer» B. 0.06 V
3.

By accelerating the magnet inside the coil, the current in it

A. increases
B. decreases
C. remains constant
D. reverses
Answer» A. increases
4.

Consequence of motor effect is

A. electromagnetic induction
B. current
C. voltage
D. e.m.f
Answer» A. electromagnetic induction
5.

Total number of magnetic field lines passing through an area is called

A. magnetic flux density
B. magnetic flux
C. e.m.f
D. voltage
Answer» B. magnetic flux
6.

Magnitude of induced e.m.f is proportional to

A. rate of change of current
B. rate of change of voltage
C. rate of change of magnetic flux linkage
D. rate of change of resistance
Answer» C. rate of change of magnetic flux linkage
7.

In transformer, the core is made up of soft iron in order to pass the maximum

A. flux
B. current
C. magnetic flux
D. voltage
Answer» C. magnetic flux
8.

For a straight wire, induced current depends upon

A. the speed of movement of wire
B. the length of wire
C. the magnitude of magnetic flux density
D. all of above
Answer» D. all of above
9.

In generators, the rate of change of flux linkage is maximum when the coil is moving through the

A. vertical position
B. horizontal position
C. diagonal position
D. at an angle of 45°
Answer» B. horizontal position
10.

E.M.F for a coil depends upon

A. the cross sectional area
B. no. of turns of wire
C. the magnitude of magnetic flux density
D. all of above
Answer» D. all of above
11.

Currents that flow in circles inside a disc are known as

A. eddy currents
B. circular currents
C. air currents
D. alternating curents
Answer» A. eddy currents
12.

When field is parallel to plane of area, magnetic flux through coil is

A. zero
B. infinite
C. 2
D. 5
Answer» A. zero
13.

Moving a coil in and out of magnetic field induces

A. force
B. potential difference
C. e.m.f
D. voltage
Answer» C. e.m.f
14.

Induced current in coil by a magnet turns it into an

A. straight wire
B. magnet
C. ammeter
D. electromagnet
Answer» D. electromagnet
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