NEET Physics: Questions 684 - 686 of 2099

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Question number: 684

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

MCQ▾

Question

An air-solenoid has 500 turns of wire in its 40 cm length. If the current in the wire be 1.0 ampere then the magnetic field on the axis inside the solenoid is –

Choices

Choice (4) Response
a.

1.57 gauss

b.

0.0157 gauss

c.

15.7 gauss

d.

0.157 gauss

Question number: 685

» Magnetic Effects of Current and Magnetism » Bar Magnet

MCQ▾

Question

The length, breadth and mass of two bar magnets are same but their magnetic moments are 3M and 2M respectively. These are joined pole to pole and are suspended by a string. When oscillated in a magnetic field of strength B, the time period obtained is 5sec. If the poles of either of the magnets are reverse then the time period of the combination in the same magnetic field will be -

Choices

Choice (4) Response
a.

33sec

b.

55sec

c.

1sec

d.

22sec

Question number: 686

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

MCQ▾

Question

A particle with charge q, moving with a momentum p, enters a uniform magnetic field normally. The magnetic field has magnitude B and is confined to a region of width d, where d<pBq, The particle is deflected by an angle θ in crossing the field. Then

Uniform magnetic field with moving charge particle

Uniform Magnetic Field With Moving Charge Particle

Here in figure cross represent the uniform magnetic field is confined to a region width d. A particle with charge q is moving with a momentum p, towards this uniform magnetic field.

Choices

Choice (4) Response
a.

sinθ=Bqdp

b.

sinθ=pBqd

c.

sinθ=pdBq

d.

sinθ=Bpqd

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