Electromagnetic Induction Test

Result

Electromagnetic Induction Test - 38

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Question 1
4 / -1

The current in a coil changes from 4 ampere to zero in 0.1 s. If the average e.m.f. induced is 100 volt, what is the self-inductance of the coil

A
2.5 H

B
25 H

C
400 H

D
40 H

Solution
Question 2
4 / -1

Pure inductance of 3.0 H is connected as shown below. The equivalent inductance of the circuit is

A
1 H

B
2 H

C
3 H

D
9 H

Solution
Question 3
4 / -1

The inductance of a closed-packed coil of 400 turns is 8 mH. A current of 5 mA is passed through it. The magnetic flux through each turn of the coil is?

A

B

C

D

Solution
Question 4
4 / -1

When the current through a solenoid increases at a constant rate, the induced current

A
Is constant and is in the direction of the inducing current

B
Is constant and is opposite to the direction of the inducing current

C
Increases with time and is in the direction of the inducing current

D
Increases with time and opposite to the direction of the inducing current
Question 5
4 / -1

In a coil rate of change of area is 5 m²/milli second and current becomes 1 A from 2 A in 2 × 10^–3 sec. If magnitude of field is 1 tesla then self-inductance of the coil is

A
2 H

B
5 H

C
20 H

D
10 H

Solution
Question 6
4 / -1

An e.m.f. of 12 volt is produced in a coil when the current in it changes at the rate of 45 amp/minute. The inductance of the coil is

A
0.25 henry

B
1.5 henry

C
9.6 henry

D
16.0 henry

Solution
Question 7
4 / -1

If the switch in the following circuit is turned off, then

A
The bulb B₁ will go out immediately whereas B₂ after sometimes

B
The bulb B₂ will go out immediately whereas B₁ after sometime

C
Both B₁ and B₂ will go out immediately

D
Both B₁ and B₂ will go out after sometime
Question 8
4 / -1

Find out the e.m.f. produced when the current changes from 0 to 1 A in 10 second, given L = 10 µ H

A
1 V

B
1 µV

C
1 mV

D
0.1 V

Solution
Question 9
4 / -1

A
1 sec

B
2 sec

C
e sec

D
2e sec

Solution
Question 10
4 / -1

A coil of inductance 40 henry is connected in series with a resistance of 8 ohm and the combination is joined to the terminals of a 2 volt battery. The time constant of the circuit is

A
40 sec

B
20 sec

C
8 sec

D
5 sec

Solution