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Question (1)

QN0039230

When current in a coil changes from to in , average voltage of is produced. The self-inductance of the coil is :

(A)
(B)
(C)
(D)

Correct Answer: D

Explanation:

According to Faraday's law of electromagnetic induction,

Induced emf,

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Question (2)

QN0039231

A small square loop of wire of side is placed inside a large square loop of wire ( ). Both loops are coplanar and their centres coincide at point as shown in figure. The mutual inductance of the system is:

(A)
(B)
(C)
(D)

Correct Answer: C

Explanation:

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Question (3)

QN0039232

If both the number of turns and core length of an inductor is doubled keeping other factors constant, then its selfinductance will be-

(A)
Unaffected
(B)
halved
(C)
doubled
(D)
quadrupled

Correct Answer: B

Explanation:

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Question (4)

QN0039233

Two coils of inductances and are linked such that their mutual inducatance is . Then

(A)
(B)
(C)
the maximum value of is
(D)
the minimum value of is

Correct Answer: D

Explanation:

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Question (5)

QN0039234

Two conducting circular loops of radii and are placed in the same plane with their centres coinciding. If , the mutual inductance between them will be directly proportional to

(A)
(B)
(C)
(D)

Correct Answer: D

Explanation:

Mutual inductance between two coil in the same plane with their centers coinciding is given by

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Question (6)

QN0039235

The mutual inductance between two planar concentric rings of radii and is given by
The mutual inductance between two planar concentric rings of radii and placed in air is given by

(A)
(B)
(C)
(D)

Correct Answer: A

Explanation:

The mutual inductance between two planar concentric rings of radii and is given by

Weber

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Question (7)

QN0039236

A circular loop of radius lies parallel to much bigger circular of radius . The centre of the small loop is on the axis of the bigger loop. The distance between their centres is . If a current of flows through the smaller loop, then the flux linked with the bigger loop is

(A)
weber
(B)
weber
(C)
weber
(D)
weber

Correct Answer: D

Explanation:

Let flux linked with smaller loop is and with bigger loop is .
Given

Now

Weber

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Question (8)

QN0039237

A coil is wound on a frame of rectangular cross-section. If all the linear dimensions of the frame are increased by a factor 2 and the number of turns per unit length of the coil remains the same, self-inductance of the coil increases by a factor of

(A)
4
(B)
8
(C)
12
(D)
16

Correct Answer: B

Explanation:

Self inductance

So, when all linear dimensions are increased by a factor of2. The new self inductance becomes .

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Question (9)

QN0039238

If the magnetic flux linked with a coil through which a current of is set up is , then the coefficient of self inductance of the coil is

(A)
henry
(B)
henry
(C)
henry
(D)
henry

Correct Answer: C

Explanation:

henry

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Question (10)

QN0039239

The self inductance associated with a coil is independent of

(A)
current
(B)
induced voltage
(C)
time
(D)
resistance of coil

Correct Answer: D

Explanation:

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Question (1)

When current in a coil changes from to in , average voltage of is produced. The self-inductance of the coil is :

Explanation:

Link:

Question (2)

A small square loop of wire of side is placed inside a large square loop of wire ( ). Both loops are coplanar and their centres coincide at point as shown in figure. The mutual inductance of the system is:

Explanation:

Link:

Question (3)

If both the number of turns and core length of an inductor is doubled keeping other factors constant, then its selfinductance will be-

Explanation:

Link:

Question (4)

Two coils of inductances and are linked such that their mutual inducatance is . Then

Explanation:

Link:

Question (5)

Two conducting circular loops of radii and are placed in the same plane with their centres coinciding. If , the mutual inductance between them will be directly proportional to

Explanation:

Link:

Question (6)

The mutual inductance between two planar concentric rings of radii and is given by The mutual inductance between two planar concentric rings of radii and placed in air is given by

Explanation:

Link:

Question (7)

A circular loop of radius lies parallel to much bigger circular of radius . The centre of the small loop is on the axis of the bigger loop. The distance between their centres is . If a current of flows through the smaller loop, then the flux linked with the bigger loop is

Explanation:

Link:

Question (8)

A coil is wound on a frame of rectangular cross-section. If all the linear dimensions of the frame are increased by a factor 2 and the number of turns per unit length of the coil remains the same, self-inductance of the coil increases by a factor of

Explanation:

Link:

Question (9)

If the magnetic flux linked with a coil through which a current of is set up is , then the coefficient of self inductance of the coil is

Explanation:

Link:

Question (10)

The self inductance associated with a coil is independent of

Explanation:

Link:

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The mutual inductance between two planar concentric rings of radii and is given by
The mutual inductance between two planar concentric rings of radii and placed in air is given by