Magnetic Effects of Current and Magnetism-Bar Magnet (NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics): Questions 1 - 5 of 27

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Question number: 1

» Magnetic Effects of Current and Magnetism » Bar Magnet

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MCQ▾

Question

A short bar magnet is placed with its north pole pointing south. The neutral point is 10 cm away from the center of the magnet. If H = 0.4 gauss, calculate magnetic moment of the magnet.

Choices

Choice (4) Response

a.

0.2Am 2

b.

lAm 2

c.

0.1 Am 2

d.

2Am 2

Question number: 2

» Magnetic Effects of Current and Magnetism » Bar Magnet

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Assertion-Reason▾

Question

Assertion (Ꭺ)

We cannot think of magnetic field configuration with three poles.

Reason (Ꭱ)

A bar magnet does not exert a torque on itself due to its own field.

Choices

Choice (4) Response

a.

Both Ꭺ and Ꭱ are false

b.

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

c.

Ꭺ is true but Ꭱ is false

d.

Ꭺ is false but Ꭱ is true

Question number: 3

» Magnetic Effects of Current and Magnetism » Bar Magnet

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MCQ▾

Question

A 30 cm long bar magnet is placed in the magnetic meridian with its north pole pointing south. The neutral point is obtained at a distance of 40 cm from the center of the magnet. Pole strength of the magnet is (The. horizontal component of earth’s magnetic field is 0.34 Gauss)

Choices

Choice (4) Response

a.

15.2 Am

b.

26.7 Am

c.

16.7 Am

d.

12.7 Am

Question number: 4

» Magnetic Effects of Current and Magnetism » Bar Magnet

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MCQ▾

Question

At magnetic equator of earth, angle of dip is

Choices

Choice (4) Response

a.

45°

b.

Zero

c.

90°

d.

180°

Question number: 5

» Magnetic Effects of Current and Magnetism » Bar Magnet

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MCQ▾

Question

A bar magnet with its poles 25 cm apart and of pole strength 24.0 A-m rests with its center on a frictionless pivot. A force F is applied on the magnet at a distance of 12 cm from the pivot, so that it is held in equilibrium at an angle of 30° with respect to a magnetic field of induction 0.25 T. The value of force F is

Choices

Choice (4) Response

a.

6.25 N

b.

6.52 N

c.

2.56 N

d.

65.62 N

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