Magnetic Effects of Current and Magnetism-Bar Magnet (NEET Physics): Questions 9 - 13 of 27

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Question number: 9

» Magnetic Effects of Current and Magnetism » Bar Magnet

MCQ▾

Question

A bar magnet of length 0.2 m and pole strength 5 Am is kept in a uniform magnetic induction field of strength 15 wb-m -2 making an angle of 30° with the field. Find the c ouple acting on it.

Choices

Choice (4) Response

a.

9.0 Nm

b.

7.5 Nm

c.

2.5 Nm

d.

5.5 Nm

Question number: 10

» Magnetic Effects of Current and Magnetism » Bar Magnet

MCQ▾

Question

The length of a bar magnet is 10 cm and its pole strength is 10 -3 Weber. It is placed in a magnetic field of induction 4 π x 10 -3 Tesla in a direction making an angle 30° with the field direction. The value of torque acting on the magnet will be -

Choices

Choice (4) Response

a.

2 π x 10 -5 N-m

b.

None

c.

0.5 x 10 2 N-m

d.

2 π x 10 -7 N-m

Question number: 11

» Magnetic Effects of Current and Magnetism » Bar Magnet

MCQ▾

Question

The period of oscillation of a freely suspended bar magnet is 4 second. If it is cut into two equal parts length wise then the time period of each part will be

Choices

Choice (4) Response

a.

0.5 sec

b.

0.25 sec

c.

4 sec

d.

2 sec

Question number: 12

» 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: 13

» 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

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