Electromagnetic Induction Test

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Electromagnetic Induction Test - 15

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Weekly Quiz Competition

Question 1
1 / -0

When a metallic plate swings between the poles of a magnet

A
No effect on the plate

B
Eddy currents are set up inside the direction of the current is along the motion of the plate

C
Eddy currents are set up inside the plate and the direction of which oppose the motion of the plate

D
Eddy currents are set up inside the plate

Solution

When a metallic plate swings between the poles of a magnet, eddy currents are set up inside the plate. These currents set up their own magnetic field which opposes the magnetic field of the poles.

Thus, the direction of the current opposes the motion of the plate.
Question 2
1 / -0

When a wire loop is rotated in a magnetic field, the frequency of change of direction of induced e.m.f changes once in each

A
1/4 revolution

B
1/2 revolution

C
1 revolution

D
2 revolution

Solution

From the knowledge of theory, the direction of induced e.m.f. will change twice per revolution.
Question 3
1 / -0

Mutual inductance of two coils can be increased by

A
Decreasing the number of turns in the coils

B
Increasing the number of turns in the coils

C
Winding the coils can on wooden core

D
None of above

Solution

The mutual inductance that exists between the two coils can be greatly increased by positioning them on a common soft iron core or by increasing the number of turns of either coil as would be found in a transformer.
Question 4
1 / -0

Which of the following is constructed on the principle of electromagnetic induction?

A
Galvanometer

B
Electric motor

C
Generator

D
Voltmeter

Solution

In a generator. E.m.f is induced according to as Lenz's rule.
Question 5
1 / -0

The efficiency of transformer is very high because

A
There is no moving part in a transformer

B
It produces very high voltage

C
It produces very low voltage

D
None of above

Solution

The efficiency of transformer is very high because there is no moving part in a transformer.
Question 6
1 / -0

Assertion: Faraday’s laws are consequences of conservation of energy.

Reason: In a purely resistive ac circuit, the current lags behind the e.m.f in phase.

(A) If both assertion and reason are true and the reason is the correct explanation of the assertion.

(B) If both assertion and reason are true but reason is not the correct explanation of the assertion.

(C) If assertion is true but reason is false.

(D) If the assertion and reason both are false.

A
A

B
B

C
C

D
D

Solution

According to Faraday's laws, the conversion of mechanical energy into electrical energy.

This is in accordance with the law of conservation of energy. It is also clearly known that in pure resistance, the e.m.f is in phase with the current.

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Re-Attempt Weekly Quiz Competition

Electromagnetic Induction Test - 15

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Electromagnetic Induction Test - 15

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Question 1

No effect on the plate

Eddy currents are set up inside the direction of the current is along the motion of the plate

Eddy currents are set up inside the plate and the direction of which oppose the motion of the plate

Eddy currents are set up inside the plate

Solution

Question 2

1/4 revolution

1/2 revolution

1 revolution

2 revolution

Solution

Question 3

Decreasing the number of turns in the coils

Increasing the number of turns in the coils

Winding the coils can on wooden core

None of above

Solution

Question 4

Galvanometer

Electric motor

Generator

Voltmeter

Solution

Question 5

There is no moving part in a transformer

It produces very high voltage

It produces very low voltage

None of above

Solution

Question 6

A

B

C

D

Solution

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