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Question (1)

QN0039205

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

(A)
charge
(B)
mass
(C)
energy
(D)
momentum

Correct Answer: C

Explanation:

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Question (2)

QN0039206

Two different wire loops are concentric and lie in the same plane. The current in the outer loop (I) is clockwise and increases with time. The induced current in the inner loop

(A)
is clockwise
(B)
is zero
(C)
is counter clockwise
(D)
has a direction that depends on the ratio of the loop radii.

Correct Answer: C

Explanation:

As I increases, increases

is such that it opposes the increases in .

Hence, decreases (By Right Hand Rule). The induced current will be counterclockwise.

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Question (3)

QN0039207

Two different wire loops are concentric and lie in the same plane. The current in the outer loop (I) is clockwise and increases with time. The induced current in the inner loop

(A)
is clockwise
(B)
is zero
(C)
is counter clockwise
(D)
has a direction that depends on the ratio of the loop radii.

Correct Answer: C

Explanation:

As I increases, increases

is such that it opposes the increases in .

Hence, decreases (By Right Hand Rule). The induced current will be counterclockwise.

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Question (4)

QN0039208

Two identical coaxial circular loops carry a current each circulating in the same direction. If the loops approach each other, you will observe that the current in

(A)
each increases
(B)
each decreases
(C)
each remains the same
(D)
one increases whereas that in the other decreases

Correct Answer: B

Explanation:

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Question (5)

QN0039209

A conducting wire frame is placed in a magnetic field which is directed into the paper. The magnetic field is increasing at a constant rate. The directions of induced current in wires and are

(A)
to and to
(B)
to and to
(C)
to and to
(D)
to and to

Correct Answer: A

Explanation:

As the magnetic field increases, its flux also increases into the page and so induced current in bigger loop will be anticlockwise. i.e., from to in bigger loop and then from to in smaller loop.

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Question (6)

QN0039210

The north pole of a bar magnet is moved towards a coil along the axis passing through the centre of the coil and perpendicular to the plane of the coil. The direction of the induced current in the coil when viewed in the direction of the motion of the magnet is

(A)
clockwise
(B)
anti-clockwise
(C)
no current in the coil
(D)
either clockwise or anti-clockwise

Correct Answer: B

Explanation:

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Question (7)

QN0039211

The north pole of a long horizontal bar magnet is being brought closer to a vertical conducting plane along the perpendicular direction. The direction of the induced current in the conducting plane will be

(A)
horizontal
(B)
clockwise
(C)
vertical
(D)
anticlockwise

Correct Answer: B

Explanation:

According to Lenz's law

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Question (8)

QN0039212

In the space shown a non-uniform magnetic field tesla is present. A closed loop of small resistance placed in the plane is given velocity . The force due to magnetic field on the loop is

(A)
zero
(B)
along direction
(C)
along direction
(D)
along ty direction

Correct Answer: C

Explanation:

Use Lenz's law. Induced emf of the current opposes the change in flux through it.

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Question (1)

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

Explanation:

Link:

Question (2)

Two different wire loops are concentric and lie in the same plane. The current in the outer loop (I) is clockwise and increases with time. The induced current in the inner loop

Explanation:

Link:

Question (3)

Two different wire loops are concentric and lie in the same plane. The current in the outer loop (I) is clockwise and increases with time. The induced current in the inner loop

Explanation:

Link:

Question (4)

Two identical coaxial circular loops carry a current each circulating in the same direction. If the loops approach each other, you will observe that the current in

Explanation:

Link:

Question (5)

A conducting wire frame is placed in a magnetic field which is directed into the paper. The magnetic field is increasing at a constant rate. The directions of induced current in wires and are

Explanation:

Link:

Question (6)

The north pole of a bar magnet is moved towards a coil along the axis passing through the centre of the coil and perpendicular to the plane of the coil. The direction of the induced current in the coil when viewed in the direction of the motion of the magnet is

Explanation:

Link:

Question (7)

The north pole of a long horizontal bar magnet is being brought closer to a vertical conducting plane along the perpendicular direction. The direction of the induced current in the conducting plane will be

Explanation:

Link:

Question (8)

In the space shown a non-uniform magnetic field tesla is present. A closed loop of small resistance placed in the plane is given velocity . The force due to magnetic field on the loop is

Explanation:

Link:

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