Electromagnetic Induction Test

Result

Electromagnetic Induction Test - 35

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Question 1
4 / -1

Two coaxial solenoids are made by winding thin insulated wire over a pipe of cross-sectional area A = 10 cm² and length = 20 cm. If one of the solenoids has 300 turns and the other 400 turns, their mutual inductance is
(µ₀ = 4 π × 10^–7 TmA^–1)

A
4.8 π × 10^–4 H

B
4.8 π × 10^–5 H

C
2.4 π × 10^–4 H

D
4.8 π × 10⁴ H

Solution
Question 2
4 / -1

A uniformly wound solenoid coil of self-inductance 1.8 × 10^–4 H and resistance 6 Ω is broken up into two identical coils. These identical coils are then connected in parallel across a 12 V battery of negligible resistance. The time constant for the current in the circuit is

A
0.1 × 10^–4 s

B
0.2 × 10^–1 s

C
0.3 × 10^–4 s

D
0.4 × 10^–4 s

Solution
Question 3
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 4
4 / -1

A coil of wire of a certain radius has 600 turns and a self-inductance of 108 mH. The self-inductance of a 2nd similar coil of 500 turns will be

A
74 mH

B
75 mH

C
76 mH

D
77 mH

Solution
Question 5
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 2A flows in it, will be

A
0.022 Wbm^–2

B
0.4 Wbm^–2

C
0.8 Wbm^–2

D
1 Wbm^–2

Solution
Question 6
4 / -1

Two circuits have coefficient of mutual induction of 0.09 henry. Average e.m.f. induced in the secondary by a change of current from 0 to 20 ampere in 0.006 second in the primary will be

A
120 V

B
80 V

C
200 V

D
300 V

Solution
Question 7
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 8
4 / -1

A coil and a bulb are connected in series with a dc source, a soft iron core is then inserted in the coil. Then

A
Intensity of the bulb remains the same

B
Intensity of the bulb decreases

C
Intensity of the bulb increases

D
The bulb ceases to glow
Question 9
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 10
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