Magnetic Effects of Current and Magnetism (NEET Physics): Questions 151 - 152 of 152

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Question number: 151

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

Appeared in Year: 2016

MCQ▾

Question

A long wire carrying a steady current is bent into a circular loop of one turn. The magnetic field at the centre of the loop is B . It is then bent into a circular coil of n turns. The magnetic field at the centre of this coil of n turns will be –

Choices

Choice (4) Response

a.

nB

b.

n2B

c.

2n2B

d.

2nB

Question number: 152

» Magnetic Effects of Current and Magnetism » Bar Magnet

Appeared in Year: 2016

MCQ▾

Question

A bar magnet is hung by a thin cotton thread in a uniform horizontal magnetic field and is in equilibrium state. The energy required to rotate it by 60° is W . Now the torque required to keep the magnet in this new position is:

Choices

Choice (4) Response

a.

3W2

b.

W3

c.

2W3

d.

3W

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