Magnetic Effects of Current and Magnetism-Bar Magnet (NEET Physics): Questions 25 - 27 of 27

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Question number: 25

» Magnetic Effects of Current and Magnetism » Bar Magnet

MCQ▾

Question

A magnet of moment M is lying in a magnetic field of induction B. W 1 is the work done in turning it from 0° to 60° and W 2 is the work done in turning it from 30° to 90°.

Choices

Choice (4) Response

a.

W2=W12

b.

W2=2W1

c.

W2=W1

d.

W2=3W1

Question number: 26

» Magnetic Effects of Current and Magnetism » Bar Magnet

MCQ▾

Question

The length, breadth and mass of two bar magnets are same but their magnetic moments are 3M and 2M respectively. These are joined pole to pole and are suspended by a string. When oscillated in a magnetic field of strength B, the time period obtained is 5sec. If the poles of either of the magnets are reverse then the time period of the combination in the same magnetic field will be -

Choices

Choice (4) Response

a.

33sec

b.

55sec

c.

1sec

d.

22sec

Question number: 27

» Magnetic Effects of Current and Magnetism » Bar Magnet

Appeared in Year: 2016

MCQ▾

Question

A bar magnet is hung by a thin cotton thread in a uniform horizontal magnetic field and is in equilibrium state. The energy required to rotate it by 60° is W . Now the torque required to keep the magnet in this new position is:

Choices

Choice (4) Response

a.

3W2

b.

W3

c.

2W3

d.

3W

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