# Magnetic Effects of Current and Magnetism-Bar Magnet (NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics): Questions 17 - 21 of 27

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## Question number: 17

» Magnetic Effects of Current and Magnetism » Bar Magnet

MCQ▾

### Question

A bar magnet of magnetic moment 4.0 A-m 2 is free to rotate about a vertical axis through its center. The magnet is released from rest from east-west position. Kinetic energy of the magnet in north-south position will be (Horizontal component of earth’s magnetic field B H = 25μT)

### Choices

Choice (4) Response

a.

10 -6 J

b.

10 -4 J

c.

0

d.

10 -2 J

## Question number: 18

» 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.

b.

c.

d.

T

## Question number: 19

» Magnetic Effects of Current and Magnetism » Bar Magnet

Assertion-Reason▾

### Assertion (Ꭺ)

Gauss theorem is not applicable in magnetism.

### Reason (Ꭱ)

Mono magnetic pole does not exist.

### Choices

Choice (4) Response

a.

Both Ꭺ and Ꭱ are false

b.

Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ

c.

Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ

d.

Ꭺ is true but Ꭱ is false

## Question number: 20

» Magnetic Effects of Current and Magnetism » Bar Magnet

MCQ▾

### Question

A bar magnet made of steel has a magnetic moment of 2.5 A-m 2 and a mass of 6.6 x 10 3 kg. If the density of steel is 7.9 x 10 9 kg/m 3, find the intensity of magnetization of the magnet.

### Choices

Choice (4) Response

a.

5.0 x 10 6 A/m

b.

1.2 x 10 6 A/m

c.

2.0 x 10 6 A/m

d.

3.0 x l0 6 A/m

## Question number: 21

» Magnetic Effects of Current and Magnetism » Bar Magnet

MCQ▾

### Question

A small magnet of magnetic moment 4A-m 2 is placed on a deflection magnetometer in tan-B position at a distance of 20 cm from the compass needle. At what distance from compass needle should another small magnet of moment 0.5 A-m 2 be placed such that the deflection of the needle remains zero?

### Choices

Choice (4) Response

a.

12 cm

b.

30 cm

c.

10 cm

d.

20 cm

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