Electromagnetic Induction Test

Result

Electromagnetic Induction Test - 62

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Weekly Quiz Competition

Question 1
4 / -1

An e.m.f. of 5 volt is produced by a self-inductance, when the current changes at a steady rate from 3 A to 2 A in 1 millisecond. The value of self-inductance is

A
Zero

B
5 H

C
5000 H

D
5 mH

Solution
Question 2
4 / -1

The current passing through a choke coil of 5 henry is decreasing at the rate of 2 ampere/sec. The e.m.f.developing across the coil is

A
10 V

B
–10 V

C
2.5 V

D
–2.5 V

Solution
Question 3
4 / -1

Average energy stored in a pure inductance L when acurrent i flows through it, is

A

B

C

D

Solution
Question 4
4 / -1

A solenoid has 2000 turns wound over a length of 0.30 metre. The area of its cross-section is 1.2 × 10^–3 m². Around its central section, a coil of 300 turns is wound. If an initial current of 2 A in the solenoid is reversed in 0.25 sec, then the e.m.f. induced in the coil is

A
6 × 10^–4 V

B
4.8 × 10^–3 V

C
6 × 10^–2 V

D
48 mV

Solution
Question 5
4 / -1

The momentum in mechanics is expressed as m × v. The analogous expression in electricity is

A
I × Q

B
I × V

C
L × I

D
L × Q

Solution
Question 6
4 / -1

In what form is the energy stored in an inductor
or
A coil of inductance L is carrying a steady current i. What is the nature of its stored energy.

A
Magnetic

B
Electrical

C
Both magnetic and electrical

D
Heat

Solution
Question 7
4 / -1

The time constant of an LR circuit represents the time inwhich the current in the circuit

A
Reaches a value equal to about 37% of its final value

B
Reaches a value equal to about 63% of its final value

C
Attains a constant value

D
Attains 50% of the constant value
Question 8
4 / -1

The mutual inductance between two coils is 1.25 henry. If the current in the primary changes at the rate of 80 ampere/second, then the induced e.m.f. in the secondary is

A
12.5 V

B
64.0 V

C
0.016 V

D
100.0 V

Solution
Question 9
4 / -1

When the number of turns in a coil is doubled without any change in the length of the coil, its self-inductancebecomes

A
Four times

B
Doubled

C
Halved

D
Unchanged

Solution
Question 10
4 / -1

The average e.m.f. induced in a coil in which the current changes from 2 ampere to 4 ampere in 0.05 second is 8 volt. What is the self-inductance of the coil

A
0.1 H

B
0.2 H

C
0.4 H

D
0.8 H

Solution