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Question (1)

QN0039224

The plane in which eddy currents are produced in a conductor is inclined to the plane of the magnetic field at an angle equal to

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

Correct Answer: D

Explanation:

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Question (2)

QN0039225

Eddy currents are produced when

(A)
A metal is kept in varying magnetic field
(B)
A metal is kept in the steady magnetic field
(C)
A circular coil is placed in a magnetic field
(D)
Through a circular coil, current is passed

Correct Answer: D

Explanation:

when I becomes half, then becomes onefourth, heat per unit time depends on square of . When is reduced is substancially reduced.

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Question (3)

QN0039226

When strength of eddy currents is reduced, as dissipation of electrical energy into heat depends on the ...A... of the strength of electrical energy into heat depends on the ...A... of the strength of electric current heat loss is substantially ... ... .
Here, and refer to

(A)
cube, increase
(B)
inverse, decreased
(C)
inverse, increased
(D)
square, reduced

Correct Answer: D

Explanation:

Electromagnetic damping certain galvanometers have a fixed core made of non-magnetic metallic material. When the coil oscillates, the eddy currents generated in the core oppose the motion and bring the coil to rest quickly.

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Question (4)

QN0039227

Certain galvanometers have a fixed core made of nonmagnetic metallic material, when the coil oscillates, ...A... generated in the core ...B... the motion and bring the coil to rest ...C...
Here, and refer to

(A)
induced emf, support, long time
(B)
induced current, support, long time
(C)
mechanical energy, oppose, long time
(D)
eddy currents, oppose, quickly

Correct Answer: D

Explanation:

Vel. of coil velocity of magnet .

As they are made to move in the same direction, their relative velocity is zero. Therefore, induced e.m.f. .

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Question (5)

QN0039228

A circular coil and a bar magnet placed nearby are made to move in the same direction. If the coil covers a distance of in 0.5 . sec and the magnet a distance of in , the induced e.m.f. produced in the coil is

(A)
zero
(B)
(C)
(D)
.

Correct Answer: A

Explanation:

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Question (6)

QN0039229

A circular coil of radius and 20 turns rotates about its vertical diameter with an angular speed of in a uniform horizontal magnetic field of magnitude . If the coil form a closed loop of resistance , then the average power loss due to joule heating is

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

Correct Answer: A

Explanation:

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Question (1)

The plane in which eddy currents are produced in a conductor is inclined to the plane of the magnetic field at an angle equal to

Explanation:

Link:

Question (2)

Eddy currents are produced when

Explanation:

Link:

Question (3)

When strength of eddy currents is reduced, as dissipation of electrical energy into heat depends on the ...A... of the strength of electrical energy into heat depends on the ...A... of the strength of electric current heat loss is substantially ... ... .
Here, and refer to

Explanation:

Link:

Question (4)

Certain galvanometers have a fixed core made of nonmagnetic metallic material, when the coil oscillates, ...A... generated in the core ...B... the motion and bring the coil to rest ...C...
Here, and refer to

Explanation:

Link:

Question (5)

A circular coil and a bar magnet placed nearby are made to move in the same direction. If the coil covers a distance of in 0.5 . sec and the magnet a distance of in , the induced e.m.f. produced in the coil is

Explanation:

Link:

Question (6)

A circular coil of radius and 20 turns rotates about its vertical diameter with an angular speed of in a uniform horizontal magnetic field of magnitude . If the coil form a closed loop of resistance , then the average power loss due to joule heating is

Explanation:

Link:

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Question (1)

The plane in which eddy currents are produced in a conductor is inclined to the plane of the magnetic field at an angle equal to

Explanation:

Link:

Question (2)

Eddy currents are produced when

Explanation:

Link:

Question (3)

When strength of eddy currents is reduced, as dissipation of electrical energy into heat depends on the ...A... of the strength of electrical energy into heat depends on the ...A... of the strength of electric current heat loss is substantially ... ... . Here, and refer to

Explanation:

Link:

Question (4)

Certain galvanometers have a fixed core made of nonmagnetic metallic material, when the coil oscillates, ...A... generated in the core ...B... the motion and bring the coil to rest ...C... Here, and refer to

Explanation:

Link:

Question (5)

A circular coil and a bar magnet placed nearby are made to move in the same direction. If the coil covers a distance of in 0.5 . sec and the magnet a distance of in , the induced e.m.f. produced in the coil is

Explanation:

Link:

Question (6)

A circular coil of radius and 20 turns rotates about its vertical diameter with an angular speed of in a uniform horizontal magnetic field of magnitude . If the coil form a closed loop of resistance , then the average power loss due to joule heating is

Explanation:

Link:

Excel With Tutors

ExcelWithTutors

For Student

For Tutors

Learn

OUR POLICY

When strength of eddy currents is reduced, as dissipation of electrical energy into heat depends on the ...A... of the strength of electrical energy into heat depends on the ...A... of the strength of electric current heat loss is substantially ... ... .
Here, and refer to

Certain galvanometers have a fixed core made of nonmagnetic metallic material, when the coil oscillates, ...A... generated in the core ...B... the motion and bring the coil to rest ...C...
Here, and refer to