Magnetic Effects of Current and Magnetism-Current Loop as Magnetic Dipole (NEET Physics): Questions 10 - 13 of 25

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Question number: 10

» Magnetic Effects of Current and Magnetism » Current Loop as Magnetic Dipole

MCQ▾

Question

A ring of radius R, made of an insulating material carries a charge Q uniformly distributed on it. If the ring rotates about the axis passing through its center and normal to plane of the ring with constant angular speed ω , then the magnitude of the magnetic moment of the ring is

Choices

Choice (4) Response

a.

12QωR2

b.

12Qω2R

c.

Qω2R

d.

QωR2

Question number: 11

» Magnetic Effects of Current and Magnetism » Current Loop as Magnetic Dipole

MCQ▾

Question

A 100 turns coil shown in figure carries a current of 2 amp in a magnetic field B = 0.2Wb/m 2. The torque acting on the coil is

A square coil placed in magnetic field

A Square Coil Placed in Magnetic Field

A current carrying square coil placed in magnetic field shown in figure.

Choices

Choice (4) Response

a.

0.32 Nm tending to rotate the side AD out of the page

b.

0.0032 Nm tending to rotate the side AD out of the page

c.

0.32 Nm tending to rotate the side AD into the page

d.

0.0032 Nm tending to rotate the side AD into the page

Question number: 12

» Magnetic Effects of Current and Magnetism » Current Loop as Magnetic Dipole

MCQ▾

Question

The radius of a circular loop is r and a current i is flowing in it. The equivalent magnetic moment will be

Choices

Choice (4) Response

a.

1r2

b.

iπr2

c.

ir

d.

2πir

Question number: 13

» Magnetic Effects of Current and Magnetism » Current Loop as Magnetic Dipole

MCQ▾

Question

A rectangular coil of size 20 cm x 20 cm has 100 turns and carries a current of 1 A. It is placed in a uniform magnetic field B = 0.5 T with the direction of magnetic field parallel to the plane of the coil. The magnitude of the torque required to hold this coil in this position is

Choices

Choice (4) Response

a.

200 Nm

b.

10 Nm

c.

Zero

d.

2 Nm

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