Electromagnetic Induction Test

Result

Electromagnetic Induction Test - 64

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Question 1
4 / -1

An e.m.f. of 100 millivolts is induced in a coil when the current in another nearby coil becomes 10 ampere from zero in 0.1 second. The coefficient of mutual inductionbetween the two coils will be

A
1 millihenry

B
10 millihenry

C
100 millihenry

D
1000 millihenry

Solution
Question 2
4 / -1

In a coil of self-inductance 0.5 henry, the current varies at a constant rate from zero to 10 amperes in 2 seconds. The e.m.f. generated in the coil is

A
10 volts

B
5 volts

C
2.5 volts

D
1.25 volts

Solution
Question 3
4 / -1

A coil of self-inductance 50 henry is joined to the terminals of a battery of e.m.f. 2 volts through a resistance of 10 ohm and a steady current is flowing through the circuit. If the battery is now disconnected, the time in which the current will decay to 1/e of its steady value is

A
500 seconds

B
50 seconds

C
5 seconds

D
0.5 seconds

Solution
Question 4
4 / -1

The mutual inductance between a primary and secondary circuits is 0.5 H. The resistances of the primary and the secondary circuits are 20 ohms and 5 ohms respectively. To generate a current of 0.4 A in the secondary, current in the primary must be changed at the rate of

A
4.0 A/s

B
16.0 A/s

C
1.6 A/s

D
8.0 A/s

Solution
Question 5
4 / -1

A coil having an inductance of 0.5 H carries a current which is uniformly varying from zero to 10 ampere in 2 second. The e.m.f. (in volts) generated in the coil is

A
10

B
5

C
2.5

D
1.25

Solution
Question 6
4 / -1

If the current is halved in a coil, then the energy stored is how much times the previous value

A

B

C
2

D
4

Solution
Question 7
4 / -1

Which of the following is a wrong statement

A
An e.m.f. can be induced between the ends of a straight conductor by moving it through a uniform magnetic field

B
The self-induced e.m.f. produced by changing current in a coil always tends to decrease the current

C
Inserting an iron core in a coil increases its coefficient of self-induction

D
According to Lenz's law, the direction of the induced current is such that it opposes the flux change that causes it
Question 8
4 / -1

A coil has an inductance of 2.5 H and a resistance of 0.5 r. If the coil is suddenly connected across a 6.0 volt battery, then the time required for the current to rise 0.63 of its final value is

A
3.5 sec

B
4.0 sec

C
4.5 sec

D
5.0 sec

Solution
Question 9
4 / -1

A LC circuit is in the state of resonance. If C = 0.1 μ F and L = 0.25 henry, neglecting ohmic resistance of circuit, what is the frequency of oscillations?

A
1007 Hz

B
100 Hz

C
109 Hz

D
500 Hz

Solution
Question 10
4 / -1

The mutual inductance of an induction coil is 5 H. In the primary coil, the current reduces from 5 A to zero in 10^–3 s. What is the induced e.m.f. in the secondary coil

A
2500 V

B
25000 V

C
2510 V

D
Zero

Solution