Electromagnetic Induction Test

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Electromagnetic Induction Test - 4

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Question 1
1 / -0

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

A
Only if the coil moves

B
Only if the magnet moves

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

D
Only if relative motion of coil and magnet is present

Solution

For electromagnetic induction magnet and coil both may move but relative motion between must be present
Question 2
1 / -0

When a bar magnet is pushed towards the coil connected in series with a galvanometer, the pointer in the galvanometer G

A
shows deflection while bar is in motion

B
oscillates

C
shows deflection while bar is stationary

D
does not move

Solution

When bar is in motion then flux will changed hence current will be induced.
Question 3
1 / -0

When current carrying coil C₂ is moved towards the coil C₁ connected in series with a galvanometer, the pointer in the galvanometer G

A
shows deflection while C₂ is stationary

B
oscillates

C
shows deflection while C₂ is in motion .

D
does not move

Solution

current induced due to flux changed when C₂ is in motion .
Question 4
1 / -0

Coils C₁ and C₂ are stationary. C₁ connected in series with a galvanometer while C₂ is connected to a battery through a tapping key. If the tapping key is pressed and released the galvaometer

A
shows deflection while current in C₂ is changing .

B
shows deflection while C₂ is stationary

C
oscillates

D
does not move

Solution

flux will be changed when current in C₂ is changing. Hence current will be induced in coil C₁.
Question 5
1 / -0

According to Farady'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 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.
Question 6
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
nothing happens to the bulb

B
the bulb absorbs light

C
the bulb keeps glowing

D
the bulb glows momentarily

Solution

Flux will be changed due to this current is induced momentarily.
Question 7
1 / -0

According to Lenz’s law.

A
The induced emf is proportional rate of change in magnetic flux that produced it.

B
The polarity of induced emf is such that it tends to produce a current which opposes the change in magnetic flux that produced it.

C
The polarity of induced emf is such that it tends to produce a current which aids the change in magnetic flux that produced it.

D
The induced emf is proportional change in magnetic flux that produced it.

Solution

The direction of an induced emf, or the current, in any circuit is such as to oppose the cause that produces it.
If the direction of the induced current were such as not to oppose then we would be obtaining electrical energy continuously without doing work, which is impossible.
Question 8
1 / -0

If the polarity of induced emf is such that it tends to produce a current which aids the change in magnetic flux that produced it, which conservation law is violated?

A
conservation of momentum

B
conservation of energy

C
conservation of charge

D
conservation of mass

Solution

In this case we would be obtaining electrical energy continuously without doing any work.

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Electromagnetic Induction Test - 4

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Question 1

Only if the coil moves

Only if the magnet moves

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

Only if relative motion of coil and magnet is present

Solution

Question 2

shows deflection while bar is in motion

oscillates

shows deflection while bar is stationary

does not move

Solution

Question 3

shows deflection while C2 is stationary

oscillates

shows deflection while C2 is in motion .

does not move

Solution

Question 4

shows deflection while current in C2 is changing .

shows deflection while C2 is stationary

oscillates

does not move

Solution

Question 5

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 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

Question 6

nothing happens to the bulb

the bulb absorbs light

the bulb keeps glowing

the bulb glows momentarily

Solution

Question 7

The induced emf is proportional rate of change in magnetic flux that produced it.

The polarity of induced emf is such that it tends to produce a current which opposes the change in magnetic flux that produced it.

The polarity of induced emf is such that it tends to produce a current which aids the change in magnetic flux that produced it.

The induced emf is proportional change in magnetic flux that produced it.

Solution

Question 8

conservation of momentum

conservation of energy

conservation of charge

conservation of mass

Solution

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shows deflection while C₂ is stationary

shows deflection while C₂ is in motion .

shows deflection while current in C₂ is changing .

shows deflection while C₂ is stationary