Magnetic Effects of Current and Magnetism (NEET Physics): Questions 39 - 43 of 152

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Question number: 39

» 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: 40

» Magnetic Effects of Current and Magnetism » Moving Coil Galvanometer

Assertion-Reason▾

Assertion (Ꭺ)

The coil is bound over the metallic frame in moving coil galvanometer.

Reason (Ꭱ)

The metallic frame help in making steady deflection without any oscillation.

Choices

Choice (4) Response
a. Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ
b. Both Ꭺ and Ꭱ are false
c. Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ
d. Ꭺ is false but Ꭱ is true

Question number: 41

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

MCQ▾

Question

Which of the following is the most suitable for the core of electromagnets?

Choices

Choice (4) Response
a.

Air

b.

Steel

c.

Soft iron

d.

Copper-nickel alloy

Question number: 42

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

MCQ▾

Question

The magnetic moment of atomic neon is

Choices

Choice (4) Response
a.

Zero

b.

μB2

c.

3μB2

d.

μB

Question number: 43

» 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

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