NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 669 - 672 of 2184

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Question number: 669

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

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MCQ▾

Question

Liquid oxygen remains suspended between two pole faces of a magnet because it is

Choices

Choice (4) Response

a.

Ferromagnetic

b.

Diamagnetic

c.

Antiferromagnetic

d.

Paramagnetic

Question number: 670

» Magnetic Effects of Current and Magnetism » Current Loop as Magnetic Dipole

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Assertion-Reason▾

Question

Assertion (Ꭺ)

Torque on the coil is maximum, when coil is suspended in a radial magnetic field.

Reason (Ꭱ)

The torque tends to rotate the coil on its own axis.

Choices

Choice (4) Response

a.

Ꭺ is false but Ꭱ is true

b.

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

c.

Both Ꭺ and Ꭱ are false

d.

Ꭺ is true but Ꭱ is false

Question number: 671

» Magnetic Effects of Current and Magnetism » Current Loop as Magnetic Dipole

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MCQ▾

Question

A rectangular loop carrying a current i is placed in a uniform magnetic field B, The area enclosed by the loop is A. If there are n turns in the loop, the torque acting on the loop is given by

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 672

» Magnetic Effects of Current and Magnetism » Ampere's Law

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MCQ▾

Question

A wire of length L carrying current I is bent into a circle of one turn. The field at the center of the coil is B 1, A similar wire of length L carrying current I is bent into a square of one turn. The field at its center is B 2. Then which of the followings are not correct?

(1) B 1 > B 2

(2) B 1 = B 2

(3)

(4) B 1 < B 2

Select the correct answers and mark it according to the following codes:

Choices

Choice (4) Response

a.

1 and 2 are correct

b.

1,2 and 3 are correct

c.

1 and 3 are correct

d.

2 and 4 are correct