NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 572 - 575 of 2320

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Question number: 572

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

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MCQ▾

Question

current of 1.0 ampere is flowing in the sides of an equilateral triangle of side 4.5 x 10 -2 m. Find the magnetic field at the centroid of the triangle.

(Permeability constant . )

Choices

Choice (4)Response

a.

6.0 x 10 -8 weber/m 2

b.

4.0 x 10 -5 weber/m 2

c.

2.0 x 10 -5 eber/m 2

d.

7.0 x 10 -12 weber/m 2

Question number: 573

» Magnetic Effects of Current and Magnetism » Bar Magnet

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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.

0.5 x 10 2 N-m

b.

2 π x 10 -5 N-m

c.

None

d.

2 π x 10 -7 N-m

Question number: 574

» Magnetic Effects of Current and Magnetism » Moving Coil Galvanometer

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Assertion-Reason▾

Question

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.

Ꭺ is true but Ꭱ is false

b.

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

c.

Both Ꭺ and Ꭱ are false

d.

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

Question number: 575

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

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MCQ▾

Question

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

Choices

Choice (4)Response

a.

Copper-nickel alloy

b.

Air

c.

Soft iron

d.

Steel

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