Electromagnetic Induction Test

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Electromagnetic Induction Test - 2

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Weekly Quiz Competition

Question 1
1 / -0

A circular loop of radius R, carrying current I, lies in xy-plane with its centre at origin. The total magnetic flux through xy-plane is

A
directly proportional to R

B
directly proportional to I

C
inversely proportional to I

D
zero
Question 2
1 / -0

A rectangular coil of copper wires is rotated in a magnetic field. The direction of the induced current changes once in each

A
two revolutions

B
one revolution

C
half revolution

D
one-fourth revolution
Question 3
1 / -0

electromagnetic induction i.e currents can be induced in coils (Select the best)

A
Only if the coil moves and magnet also moves in the same direction

B
Only if the magnet moves

C
if relative motion of coil and magnet is present.

D
Only if the coil moves

Solution

for electromagnetic induction magnet and coil both may move but relative motion between must be present
Question 4
1 / -0

Coils C₁ and C₂ are stationary. C₁ connected in series with one very small Diwali bulb while C2 is connected to a battery. If the connection is suddenly snapped

A
the bulb absorbs light

B
the bulb keeps glowing

C
nothing happens to the bulb

D
the bulb glows momentarily.

Solution

Flux will be changed due to this current is induced momentarily
Question 5
1 / -0

In a car spark coil, an emf of 40000 volts is induced in its secondary winding when the current in its primary winding changes from 4 A to zero in 10 μs. The mutual inductance between the primary and the secondary windings of the spark coil is

A
0.1 H

B
0.3 H

C
0.2 H

D
0.4 H
Question 6
1 / -0

The dimensional equation for magnetic flux is

A
[ML²T^-2I^-1]

B
[ML²T^-2I^-2]

C
[ML^-2T^-2I^-1]

D
[ML^-2T^-2I^-2]
Question 7
1 / -0

What is the self-inductance of an air-core solenoid of length 3.14 m and cross-sectional area 10^–3 m² with 500 turns?

A
0.1 mH

B
0.2 mH

C
0.3 mH

D
0.4 mH
Question 8
1 / -0

According to Faraday's law

A
The magnitude of the induced emf in a circuit is equal to the time rate of change of magnetic flux through the circuit. .

B
The magnitude of the induced emf in a circuit is equal to the time of change of magnetic flux through the circuit.

C
The magnitude of the induced emf in a circuit is equal to the time of change of magnetic flux through the circuit.

D
The magnitude of the induced emf in a circuit is proportional to the time of change of magnetic flux through the circuit.

Solution

The induced electromotive force in any closed circuit is equal to the negative of the time rate of change of the magnetic flux enclosed by the circuit.

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Electromagnetic Induction Test - 2

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Electromagnetic Induction Test - 2

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Question 1

directly proportional to R

directly proportional to I

inversely proportional to I

zero

Question 2

two revolutions

one revolution

half revolution

one-fourth revolution

Question 3

Only if the coil moves and magnet also moves in the same direction

Only if the magnet moves

if relative motion of coil and magnet is present.

Only if the coil moves

Solution

Question 4

the bulb absorbs light

the bulb keeps glowing

nothing happens to the bulb

the bulb glows momentarily.

Solution

Question 5

0.1 H

0.3 H

0.2 H

0.4 H

Question 6

[ML2T -2I-1]

[ML2T -2I-2]

[ML-2T -2I-1]

[ML-2T -2I-2]

Question 7

0.1 mH

0.2 mH

0.3 mH

0.4 mH

Question 8

The magnitude of the induced emf in a circuit is equal to the time rate of change of magnetic flux through the circuit. .

The magnitude of the induced emf in a circuit is equal to the time of change of magnetic flux through the circuit.

The magnitude of the induced emf in a circuit is equal to the time of change of magnetic flux through the circuit.

The magnitude of the induced emf in a circuit is proportional to the time of change of magnetic flux through the circuit.

Solution

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[ML²T^-2I^-1]

[ML²T^-2I^-2]

[ML^-2T^-2I^-1]

[ML^-2T^-2I^-2]