Magnetic Effects of Current and Magnetism (NEET Physics): Questions 128 - 131 of 152

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Question number: 128

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

MCQ▾

Question

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

Choices

Choice (4) Response
a.

Ferromagnetic

b.

Antiferromagnetic

c.

Diamagnetic

d.

Paramagnetic

Question number: 129

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

Assertion-Reason▾

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

Question number: 130

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

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.

1n(iAB)

b.

1n(iA×B)

c.

niAB

d.

niA×B

Question number: 131

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

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) B1B2=2

(4) B 1 < B 2

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

Choices

Choice (4) Response
a.

1 and 3 are correct

b.

1 and 2 are correct

c.

2 and 4 are correct

d.

1, 2 and 3 are correct

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