Electromagnetic Induction Test

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Electromagnetic Induction Test - 9

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Question 1
4 / -1

Directions : In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.
Assertion(A): Faraday ’s laws of electromagnetic induction are consequences of law of conservation of energy.
Reason (R): The parameter LR in a L-R circuit has the dimension of time.

A
A. Both A and R are true and R is the correct explanation of A

B
B. Both A and R are true but R is NOT the correct explanation of A

C
C. A is true but R is false

D
D. A is false and R is true

Solution

In electromagnetic induction, magnetic energy, mechanical energy are converted into electrical energy. So, Faraday’s laws of electromagnetic induction are direct consequences of law of conservation of energy. Hence assertion is true. In a L-R circuit, L/R parameter has the dimension of time. Hence the reason is false.
Question 2
4 / -1

Directions : In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.
Assertion (A): Lenz’s law does not violets the principle of conservation of energy.
Reason (R): Induce e.m.f. never opposes the change in magnetic flux that causes the e.m.f.

A
A. Both A and R are true and R is the correct explanation of A

B
B. Both A and R are true but R is NOT the correct explanation of A

C
C. A is true but R is false

D
D. A is false and R is true

Solution

Lenz’s law is based on principle of conservation of energy. So, the assertion is true. Induced e.m.f. always opposes the change in magnetic flux that causes the e.m.f. So, the reason is also false.
Question 3
4 / -1

Directions : In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.
Assertion (A): When the magnetic flux changes around a metallic conductor, the eddy current is produced.
Reason (R): Electric potential determines the flow of charge.

A
A. Both A and R are true and R is the correct explanation of A

B
B. Both A and R are true but R is NOT the correct explanation of A

C
C. A is true but R is false

D
D. A is false and R is true

Solution

Change in flux induces emf in conductor which generates eddy current. So assertion is true. Electric potential determines the flow of charge. So reason is also true. But reason is not the proper explanation of generation of eddy current.
Question 4
4 / -1

Directions : In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.
Assertion (A): Mutual inductance becomes maximum when coils are wound on each other.
Reason (R): Mutual inductance is independent of orientation of coils.

A
A. Both A and R are true and R is the correct explanation of A

B
B. Both A and R are true but R is NOT the correct explanation of A

C
C. A is true but R is false

D
D. A is false and R is true

Solution

Mutual inductance depends on size, number of turns, relative position and relative orientation of the 2 coils. So, when coils are wound on each other, the mutual inductance will be maximum. So, assertion is true, But the reason is false.
Question 5
4 / -1

Directions: These questions consist of two statements, each printed as Assertion and Reason. While answering these questions, you are required to choose any one of the following four responses.
Assertion: Induced emf will always occur whenever there is change in magnetic flux.
Reason: Current always induces whenever there is change in magnetic flux.

A
A. If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.

B
B. If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.

C
C. If the Assertion is correct but Reason is incorrect.

D
D. If both the Assertion and Reason are incorrect.

Solution

Emf will always induces whenever, there is change in magnetic flux. The current will induced only in closed loop.
Question 6
4 / -1

Directions: These questions consist of two statements, each printed as Assertion and Reason. While answering these questions, you are required to choose any one of the following four responses.
Assertion: Only a change in magnetic flux will maintain an induced current in the coil.
Reason: The presence of large magnetic flux through a coil maintain a current in the coil of the circuit is continuous.

A
A. If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.

B
B. If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.

C
C. If the Assertion is correct but Reason is incorrect.

D
D. If both the Assertion and Reason are incorrect.

Solution

Induced current (emf) in a coil is directly propertional to the rate of change of magnetic flux linked with the coil. If there is no change in the flux, there is no induced current also.
Question 7
4 / -1

Directions: These questions consist of two statements, each printed as Assertion and Reason. While answering these questions, you are required to choose any one of the following four responses.
Assertion : An induced current has a direction such that the magnetic field due to the current opposes the change in the magnetic flux that induces the current.
Reason : Above statement is in accordance with conservation of energy.

A
A. If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.

B
B. If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.

C
C. If the Assertion is correct but Reason is incorrect.

D
D. If both the Assertion and Reason are incorrect.

Solution

According to Lenz's Law, the current is induced in such a direction that it opposes the change in magnetic flux linked with the coil. Lenz's law is in accordance with the Principle of Conservation of Energy. Hence, both Assertion and Reason are correct and Reason is a correct explanation of Assertion.
Question 8
4 / -1

Directions: These questions consist of two statements, each printed as Assertion and Reason. While answering these questions, you are required to choose any one of the following four responses.
Assertion : Figure shows a horizontal solenoid connected to a battery and a switch. A copper ring is placed on a smooth surface, the axis of the ring being horizontal. As the switch is closed, the ring will move away from the solenoid.
Reason : Induced emf in the ring, e=-dΦ/dt

A
A. If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.

B
B. If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.

C
C. If the Assertion is correct but Reason is incorrect.

D
D. If both the Assertion and Reason are incorrect.

Solution

When switch is closed , the magnetic flux through the ring will increase and so ring will move away form the solenoid so as to compensate this flux. This is according to Lenz’s law.
Question 9
4 / -1

Directions: These questions consist of two statements, each printed as Assertion and Reason. While answering these questions, you are required to choose any one of the following four responses.
Assertion : Figure shows a metallic conductor moving in magnetic field. The induced emf across its ends is zero.
Reason : The induced emf across the ends of a conductor is given by e = Bvℓ sinθ.

A
A. If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.

B
B. If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.

C
C. If the Assertion is correct but Reason is incorrect.

D
D. If both the Assertion and Reason are incorrect.

Solution

when a metallic strip of length l is moving in a magnetic field of flux density B with speed v in a direction perpendicular to magnetic field,
EMF developed across its length is ( v × B × l )
Hence , square plate, that is made up of many number strips will get EMF as shown in figure. Reason also wrong since there is no need to have rate of chang of magnetic field .
Question 10
4 / -1

Directions: These questions consist of two statements, each printed as Assertion and Reason. While answering these questions, you are required to choose any one of the following four responses.
Assertion : An induced emf appears in any coil in which the current is changing.
Reason : Self induction phenomenon obeys Faraday’s law of induction.

A
A. If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.

B
B. If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.

C
C. If the Assertion is correct but Reason is incorrect.

D
D. If both the Assertion and Reason are incorrect.

Solution

Changing current produces a changing flux inside the coil due to self induction and from Faraday's Law changing flux will induce an emf inside the coil. Hence Assertion and Reasoning both are Correct and Reason is correct explanation of Assertion.

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Electromagnetic Induction Test - 9

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Question 1

A. Both A and R are true and R is the correct explanation of A

B. Both A and R are true but R is NOT the correct explanation of A

C. A is true but R is false

D. A is false and R is true

Solution

Question 2

A. Both A and R are true and R is the correct explanation of A

B. Both A and R are true but R is NOT the correct explanation of A

C. A is true but R is false

D. A is false and R is true

Solution

Question 3

A. Both A and R are true and R is the correct explanation of A

B. Both A and R are true but R is NOT the correct explanation of A

C. A is true but R is false

D. A is false and R is true

Solution

Question 4

A. Both A and R are true and R is the correct explanation of A

B. Both A and R are true but R is NOT the correct explanation of A

C. A is true but R is false

D. A is false and R is true

Solution

Question 5

A. If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.

B. If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.

C. If the Assertion is correct but Reason is incorrect.

D. If both the Assertion and Reason are incorrect.

Solution

Question 6

A. If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.

B. If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.

C. If the Assertion is correct but Reason is incorrect.

D. If both the Assertion and Reason are incorrect.

Solution

Question 7

A. If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.

B. If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.

C. If the Assertion is correct but Reason is incorrect.

D. If both the Assertion and Reason are incorrect.

Solution

Question 8

A. If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.

B. If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.

C. If the Assertion is correct but Reason is incorrect.

D. If both the Assertion and Reason are incorrect.

Solution

Question 9

A. If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.

B. If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.

C. If the Assertion is correct but Reason is incorrect.

D. If both the Assertion and Reason are incorrect.

Solution

Question 10

A. If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.

B. If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.

C. If the Assertion is correct but Reason is incorrect.

D. If both the Assertion and Reason are incorrect.

Solution

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