Electromagnetic Induction Test

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Electromagnetic Induction Test - 12

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Weekly Quiz Competition

Question 1
1 / -0

In electromagnetic induction, the induced e.m.f. in a coil is independent of

A
Change in the flux

B
Time

C
Resistance of the circuit

D
None of the above

Solution

Because induced e.m.f. is given by E = −Ndφ/dt
Question 2
1 / -0

Lenz's law is consequence of the law of conservation of

A
Charge

B
Momentum

C
Mass

D
Energy

Solution

The energy of the field increases with the magnitude of the field. Lenz’s law infers that there is an opposite field created due to increase or decrease of magnetic flux around a conductor so as to hold the law of conservation of energy.
Question 3
1 / -0

A magnet is brought towards a coil (i) speedily (ii) slowly then the induced e.m.f./induced charge will be respectively

A
More in first case/More in first case

B
More in first case/Equal in both case

C
Less in first case/More in second case

D
Less in fist case/Equal in both case

Solution

The magnitude of induced e.m.f. is directly proportional to the rate of change of magnetic flux. Induced charge doesn’t depend upon time.
Question 4
1 / -0

A magnet is dropped down an infinitely long vertical copper tube

A
The magnet moves with continuously increasing velocity and ultimately acquires a constant terminal velocity

B
The magnet moves with continuously decreasing velocity and ultimately comes to rest

C
The magnet moves with continuously increasing velocity but constant acceleration

D
The magnet moves with continuously increasing velocity and acceleration

Solution

If bar magnet is falling vertically through the hollow region of long vertical copper tube then the magnetic flux linked with the copper tube (due to 'non-uniform' magnetic field of magnet) changes and eddy currents are generated in the body of the tube by Lenz's law the eddy currents opposes the falling of the magnet which therefore experience a retarding force.

The retarding force increases with increasing velocity of the magnet and finally equals the weight of the magnet. The magnet then attains a constant final terminal velocity i.e. magnet ultimately falls with zero acceleration in the tube.
Question 5
1 / -0

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 magnetised

Solution

Magnetic flux linked with the ring changes so current flows through it.
Question 6
1 / -0

A 10-metre wire kept in east-west falling with velocity 5 m/sec perpendicular to the field 0.3 x 10⁻⁴ Wb/m². The induced e.m.f. across the terminal will be

A
0.15 V

B
1.5 mV

C
1.5 V

D
15.0 V

Solution

Induced e.m.f. = Blv = 0.3 x 10⁻⁴ x 10 x 5

= 1.5 x 10⁻³ V

= 1.5 mV

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Electromagnetic Induction Test - 12

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Electromagnetic Induction Test - 12

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Question 1

Change in the flux

Time

Resistance of the circuit

None of the above

Solution

Question 2

Charge

Momentum

Mass

Energy

Solution

Question 3

More in first case/More in first case

More in first case/Equal in both case

Less in first case/More in second case

Less in fist case/Equal in both case

Solution

Question 4

The magnet moves with continuously increasing velocity and ultimately acquires a constant terminal velocity

The magnet moves with continuously decreasing velocity and ultimately comes to rest

The magnet moves with continuously increasing velocity but constant acceleration

The magnet moves with continuously increasing velocity and acceleration

Solution

Question 5

Current flows through the copper ring

Voltage in the magnet increase

Current flows in the magnet

Copper ring will get magnetised

Solution

Question 6

0.15 V

1.5 mV

1.5 V

15.0 V

Solution

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