Electromagnetic Induction Test

Result

Electromagnetic Induction Test - 59

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Question 1
4 / -1

The total charge induced in a conducting loop when it is moved in magnetic field depends on

A
The rate of change of magnetic flux

B
Initial magnetic flux only

C
The total change in magnetic flux

D
Final magnetic flux only

Solution
Question 2
4 / -1

A rectangular coil of 20 turns and area of cross-section 25 sq cm has a resistance of 100 ohm. If a magnetic field which is perpendicular to the plane of the coil changes at the rate of 1000 tesla per second, the current in the coil is

A
1.0 ampere

B
50 ampere

C
0.5 ampere

D
5.0 ampere

Solution
Question 3
4 / -1

If a coil of metal wire is kept stationary in anon-uniform magnetic field, then

A
An e.m.f. is induced in the coil

B
A current is induced in the coil

C
Neither e.m.f. nor current is induced

D
Both e.m.f. and current is induced
Question 4
4 / -1

The magnetic flux linked with a coil, in webers, is given by the equations ϕ = 3 t² + 4t + 9. Then the magnitude of induced e.m.f. at t = 2 second will be

A
2 volt

B
4 volt

C
8 volt

D
16 volt

Solution
Question 5
4 / -1

A coil has an area of 0.05 m² and it has 800 turns. It is placed perpendicularly in a magnetic field of strength 4 × 10^–5Wb/m², it is rotated through 90° in 0.1 sec. The average e.m.f. induced in the coil is

A
0.056 V

B
0.046 V

C
0.026 V

D
0.016 V

Solution
Question 6
4 / -1

Whenever a magnet is moved either towards or away from a conducting coil, an e.m.f. is induced, the magnitude of which is independent of

A
The strength of the magnetic field

B
The speed with which of the magnet is moved

C
The number of turns in the coil

D
The resistance of the coil

Solution
Question 7
4 / -1

Induced potential in a coil is developed by change of magnetic flux from 1 wb to 0.1 wb in 0.1 second is

A
1/9 volt

B
0.09 volt

C
1 volt

D
9 volt
Question 8
4 / -1

If a copper ring is moved quickly towards south pole of a powerful stationary bar magnet, then

A
Current flows through the copper ring

B
Voltage in the magnet increase

C
Current flows in the magnet

D
Copper ring will get magnetized
Question 9
4 / -1

In a magnetic field of 0.05 T, area of a coil changes from 101 cm² to 100 cm² without changing the resistance which is 2 Ω. The amount of charge that flow duringthis period is

A
2.5 × 10^–6 coulomb

B
2 × 10^–6 coulomb

C
10^–6 coulomb

D
8 × 10^–6 coulomb

Solution
Question 10
4 / -1

A square loop of wire, side length 10 cm is placed at angle of 45° with a magnetic field that changes uniformly from 0.1 T to zero in 0.7 seconds. The induced current in the loop (its resistance is 1 Ω) is

A
1.0 mA

B
2.5 mA

C
3.5 mA

D
4.0 mA

Solution