Magnetic Effects of Current and Magnetism (NEET Physics): Questions 84 - 87 of 152

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Question number: 84

» 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: 85

» 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: 86

» Magnetic Effects of Current and Magnetism » Bar Magnet

MCQ▾

Question

A thin magnetic needle oscillates in a horizontal plane with a period T. It is broken into n equals parts. The time period of each part will be-

Choices

Choice (4) Response

a.

Tn

b.

Tn2

c.

Tn2

d.

T

Question number: 87

» Magnetic Effects of Current and Magnetism » Moving Coil Galvanometer

MCQ▾

Question

The pole pieces of the magnet used in a pivoted coil galvanometer are

Choices

Choice (4) Response

a.

Plane surfaces of a horse-shoe magnet

b.

Cylindrical surfaces of a bar magnet

c.

Plane surfaces of a bar magnet

d.

Cylindrical surfaces of a horse-shoe magnet

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