Electromagnetic Induction Test

Result

Electromagnetic Induction Test - 13

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Question 1
1 / -0

When a wire loop is rotated in a magnetic field, the 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

This is the case of periodic EMI
Question 2
1 / -0

A two-metre wire is moving with a velocity of 1 m/sec perpendicular to a magnetic field of 0.5 weber/m². The e.m.f. induced in it will be

A
0.5 volt

B
0.1 volt

C
1 volt

D
2 volt

Solution

E = Blv

= 0.5 x 2 x 1

= 1 V
Question 3
1 / -0

Assertion: Eddy currents is produced in any metallic conductor when magnetic flux is changed around it.

Reason: Electric potential determines the flow of charge

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

Solution

When a metallic conductor is moved in a magnetic field; magnetic flux is varied. It disturbs the free electrons of the metal and set up an induced emf in it. As there are no free ends of the metal i.e. it will be closed in itself so there will be induced current.
Question 4
1 / -0

In a dc motor, induced e.m.f. will be maximum

A
When motor takes maximum speed

B
When motor starts rotating

C
When speed of motor increases

D
When motor is switched off

Solution

Back emf ∝ speed of motor.