Magnetic Effects of Current and Magnetism (AIIMS (All India Institute of Medical Sciences) Physics): Questions 30 - 34 of 49

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Question number: 30

» Magnetic Effects of Current and Magnetism » Earth's Magnetic Field

Appeared in Year: 2004

Assertion-Reason▾

Assertion (Ꭺ)

The true geographic north direction is found by using a compass needle.

Reason (Ꭱ)

The magnetic meridian of the earth is along the axis of rotation of the earth.

Choices

Choice (4) Response

a.

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

b.

Ꭺ is false but Ꭱ is true

c.

Ꭺ is true but Ꭱ is false

d.

Both Ꭺ and Ꭱ are false

Question number: 31

» Magnetic Effects of Current and Magnetism » Bar Magnet

Appeared in Year: 2002

Assertion-Reason▾

Assertion (Ꭺ)

We cannot think of a magnetic field configuration with three poles.

Reason (Ꭱ)

A bar magnet does exert a torque on itself due to its own field.

Choices

Choice (4) Response

a.

Both Ꭺ and Ꭱ are false

b.

Ꭺ is false but Ꭱ is true

c.

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

d.

Ꭺ is true but Ꭱ is false

Question number: 32

» Magnetic Effects of Current and Magnetism » Para, Dia and Ferro-Magnetic Substances

MCQ▾

Question

Magnetic permeability is minimum for –

Choices

Choice (4) Response

a.

Diamagnetic substance

b.

Ferromagnetic substance

c.

Paramagnetic substance

d.

None of the above

Question number: 33

» Magnetic Effects of Current and Magnetism » Bar Magnet

MCQ▾

Question

Force between two identical bar magnets whose centers are meter apart is 5.4 N when their axes are in same line. If separation is increased to , the force between them is reduced to:

Choices

Choice (4) Response

a.

0.3 N

b.

2.4 N

c.

1.2 N

d.

0.6 N

Question number: 34

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

MCQ▾

Question

A closely wound flat circular coil of 30 turns of wire has diameter of 12 cm and carries a current of 6 ampere. Determine the magnetic flux density at the centre of the coil:

Choices

Choice (4) Response

a.

b.

c.

d.

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