Magnetic Effects of Current and Magnetism (NEET Physics): Questions 50 - 53 of 152

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Question number: 50

» Magnetic Effects of Current and Magnetism » Bar Magnet

MCQ▾

Question

A short magnet of length 4 cm is kept at a distance of 20 cm to the east of a compass box such that is axis is perpendicular to the magnetic meridian. If the deflection produced is 45°, find the pole strength (H = 30 Am -1)

Choices

Choice (4) Response

a.

17.7 Am

b.

37.7 Am

c.

44.2 Am

d.

27.7 Am

Question number: 51

» Magnetic Effects of Current and Magnetism » Bar Magnet

MCQ▾

Question

A north pole of strength 50 Am and South Pole of strength 100 Am are separated by a distance of 10 cm in air. Find the force between them.

Choices

Choice (4) Response

a.

20 x 10 -6 N

b.

25 x 10 -3 N

c.

30 x 10 -18 N

d.

50 x 10 -3 N

Question number: 52

» Magnetic Effects of Current and Magnetism » Moving Coil Galvanometer

MCQ▾

Question

In a moving coil galvanometer, the deflection of the coil θ is related to the electrical current i by the relation

Choices

Choice (4) Response

a.

itanθ

b.

iθ

c.

iθ2

d.

iθ

Question number: 53

» Magnetic Effects of Current and Magnetism » Biot - Savart Law

MCQ▾

Question

The straight long conductors AOB and COD are perpendicular to each other and carry current i1 and i2 . The magnitude of the magnetic induction at point P at a distance ‘a’ from the point O in a direction perpendicular to the plane ACBD is

 Conductors AOB and COB explained above

Conductors AOB and COB Explained Above

The straight long conductors AOB and COD are perpendicular to each other and carry current i1 andi2. Magnetic field should be finding at point P at a distance ‘a’ from the point O in a direction perpendicular to the plane ACBD.

Choices

Choice (4) Response

a.

μ02πa(i12+i22)12

b.

μ02πai1i2i1+i2

c.

μ02πa(i1+i2)

d.

μ02πa(i1i2)

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