NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 684 - 687 of 2142

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Question number: 684

» 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.

b.

c.

d.

Question number: 685

» 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 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.

b.

c.

d.

Question number: 686

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

MCQ▾

Question

wire of length L has magnetic moment M. It is bent in to semicircular arc. The new magnetic moment is,

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 687

» Magnetic Effects of Current and Magnetism » Magnetic Susceptibility and Permeability

MCQ▾

Question

Which of the following statements are false about the magnetic susceptibility x m of paramagnetic substance?

(1) Value of X m is directly proportional to the absolute temperature of the sample

(2) X m is negative at all temperature

(3) X m does not depend on the temperature of the sample

(4) X m is positive at all temperature

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

Choices

Choice (4) Response

a.

1, 2 and 3 are correct

b.

1 and 2 are correct

c.

2 and 4 are correct

d.

1 and 3 are correct

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