Magnetic Effects of Current and Magnetism (NEET Physics): Questions 15 - 18 of 152

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Question number: 15

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

MCQ▾

Question

A conducting circular loop of radius r carries a constant current i. It is placed in a uniform magnetic field B, such that B is perpendicular to the plane of the loop. The magnetic force acting on the loop is

Choices

Choice (4) Response
a.

zero

b.

2πriB

c.

irB

d.

πriB

Question number: 16

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

MCQ▾

Question

A circular coil of radius 4 cm has 50 turns. In this coil a current of 2 A is flowing. It is placed in a magnetic field of 0.1 weber/m 2. The amount of work done in rotating it through 180° from its equilibrium position will be

Choices

Choice (4) Response
a.

0.1 J

b.

0.8 J

c.

0.4 J

d.

0.2 J

Question number: 17

» Magnetic Effects of Current and Magnetism » Electric Charge Moving in Magnetic Field

Assertion-Reason▾

Assertion (Ꭺ)

If an electron is not deflected while passing through a certain region of space, then only possibility is that there is no magnetic region.

Reason (Ꭱ)

Magnetic force is directly proportional to the magnetic field applied.

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 true and Ꭱ is the correct explanation of Ꭺ
d. Ꭺ is true but Ꭱ is false

Question number: 18

» Magnetic Effects of Current and Magnetism » Electric Charge Moving in Magnetic Field

Assertion-Reason▾

Assertion (Ꭺ)

For a charged particle to pass through a uniform electro-magnetic field without change in velocity, its velocity vector must be perpendicular to the magnetic field.

Reason (Ꭱ)

Net Lorentz force on the particle is given by F=q[E+v×B]

Choices

Choice (4) Response
a. Ꭺ is true but Ꭱ is false
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

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