Electromagnetic Induction Test

Result

Electromagnetic Induction Test - 63

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Question 1
4 / -1

If a current of 3.0 amperes flowing in the primary coil is reduced to zero in 0.001 second, then the induced e.m.f. in the secondary coil is 15000 volts. The mutual inductance between the two coils is

A
0.5 henry

B
5 henry

C
1.5 henry

D
10 henry

Solution
Question 2
4 / -1

An e.m.f. of 12 volts is induced in a given coil when the current in it changes at the rate of 48 amperes per minute. The self-inductance of the coil is

A
0.25 henry

B
15 henry

C
1.5 henry

D
9.6 henry

Solution
Question 3
4 / -1

A closely wound coil of 100 turns and area of cross-section 1 cm² has a coefficient of self-induction 1 mH. The magnetic induction in the centre of the core of the coil when a current of 2 A flows in it, will be

A
0.022 Wb m^–2

B
0.4 Wb m^–2

C
0.8 Wb m^–2

D
1 Wb m^–2

Solution
Question 4
4 / -1

In the following circuit, the bulb will become suddenly bright, if

A
Contact is made or broken

B
Contact is made

C
Contact is broken

D
Won't become bright at all
Question 5
4 / -1

Two pure inductors each of self-inductance L are connected in parallel but are well separated from each other. The total inductance in

A
2L

B
L

C

D
Question 6
4 / -1

Self-induction of a solenoid is

A
Directly proportional to current flowing through the coil

B
Directly proportional to its length

C
Directly proportional of area of cross-section

D
Inversely proportional to area of cross-section

Solution
Question 7
4 / -1

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 on wooden core

D
None of the above
Question 8
4 / -1

In a choke coil, the resistance X_L and resistance R aresuch that

A
X_L = R

B
X_L>> R

C
X_L<

D
X_L = ∞
Question 9
4 / -1

The number of turns of primary and secondary coils of a transformer are 5 and 10 respectively and the mutual inductance of the transformer is 25 henry. Now the number of turns in the primary and secondary of the transformer are made 10 and 5 respectively. The mutual inductance of the transformer in henry will be

A
6.25

B
12.5

C
25

D
50

Solution
Question 10
4 / -1

A current I = 10 sin (100 π t) A is passed in first coil, which induces a maximum e.m.f. of 5 πV in second coil. The mutual inductance between the coils in

A
5 mH

B
10 mH

C
15 mH

D
20 mH

Solution