NEET Physics: Questions 686 - 690 of 2098

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Question number: 686

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

MCQ▾

Question

wire of length L has magnetic moment M. It is bent in to semicircular arc. The new magnetic moment is,

Choices

Choice (4) Response

a.

M2L

b.

2ML

c.

2Mπ

d.

ML

Question number: 687

» Magnetic Effects of Current and Magnetism » Magnetic Susceptibility and Permeability

MCQ▾

Question

Which of the following statements are false about the magnetic susceptibility x m of paramagnetic substance?

(1) Value of X m is directly proportional to the absolute temperature of the sample

(2) X m is negative at all temperature

(3) X m does not depend on the temperature of the sample

(4) X m is positive at all temperature

Select the correct answers and mark it according to the following codes:

Choices

Choice (4) Response

a.

1, 2 and 3 are correct

b.

1 and 2 are correct

c.

2 and 4 are correct

d.

1 and 3 are correct

Question number: 688

» Magnetic Effects of Current and Magnetism » Moving Coil Galvanometer

MCQ▾

Question

What is the shape of magnet in moving coil galvanometer to make the radial magnetic field?

Choices

Choice (4) Response

a.

Convex cylindrical

b.

None

c.

Horse shoe magnet

d.

Concave cylindrical

Question number: 689

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

MCQ▾

Question

A current of 30 A is flowing in a vertical straight wire. If the horizontal component of earth’s magnetic field is 2 x 10 -5 tesla then the distance of null point from wire is –

Choices

Choice (4) Response

a.

0.3 m

b.

0.3 cm

c.

0.3 mm

d.

0.9 m

Question number: 690

» Electromagnetic Induction & Alternating Currents » Faraday's Law

MCQ▾

Question

The magnetic flux passing perpendicular to the plane of the coil and directed into the paper is varying according to the relation 3t2+2t+3 , where is in milli-weber and t is in second. Then the magnitude of emf induced in the loop when t = 2 second is-

Choices

Choice (4) Response

a.

19 mV

b.

31 mV

c.

-14 mV

d.

-6 mV

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