Magnetic Effects of Current and Magnetism (NEET Physics): Questions 34 - 38 of 152

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Question number: 34

» Magnetic Effects of Current and Magnetism » Bar Magnet

MCQ▾

Question

A bar magnet of length 0.2 m and pole strength 5 Am is kept in a uniform magnetic induction field of strength 15 wb-m -2 making an angle of 30° with the field. Find the c ouple acting on it.

Choices

Choice (4) Response

a.

9.0 Nm

b.

7.5 Nm

c.

2.5 Nm

d.

5.5 Nm

Question number: 35

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

MCQ▾

Question

A magnetizing field of 2×103ampm produces a magnetic flux density of 8π Tesla in an iron rod. The relative permeability of the rod will be,

Choices

Choice (4) Response

a.

10 2

b.

10°

c.

10 4

d.

10 1

Question number: 36

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

MCQ▾

Question

A l m long conducting wire is lying at right angles to the magnetic field. A force of 1 kg weight is acting on it in a magnetic field of 0.98 tesla. The current flowing in it will be,

Choices

Choice (4) Response

a.

10 A

b.

100 A

c.

1A

d.

0

Question number: 37

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

MCQ▾

Question

In the example above, after how much time, particle comes to the starting point for the first time, (mass of particle = m)

Choices

Choice (4) Response

a.

2πm3qB

b.

Never

c.

It will leave the circular path before coming to the starting point

d.

2πmqB

Question number: 38

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

MCQ▾

Question

current of 1.0 ampere is flowing in the sides of an equilateral triangle of side 4.5 x 10 -2 m. Find the magnetic field at the centroid of the triangle.

(Permeability constant μ0=4π×107N/A2 . )

Choices

Choice (4) Response

a.

2.0 x 10 -5 eber/m 2

b.

7.0 x 10 -12 weber/m 2

c.

6.0 x 10 -8 weber/m 2

d.

4.0 x 10 -5 weber/m 2

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