NEET Physics: Questions 556 - 559 of 2142

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Question number: 556

» Electromagnetic Induction & Alternating Currents » Faraday's Law

MCQ▾

Question

A bicycle wheel of radius 0.5 m has 32 spokes. It is rotating at the rate of 120 revolutions per minute, perpendicular to the horizontal component of earth’s magnetic field B H = 4 x 10 -5 tesla. The emf induced between the rim and the center of the wheel will be,

Choices

Choice (4) Response

a.

6.0 x 10 -5 V

b.

4.8 x 10 -5 V

c.

6.28 x 10 -5 V

d.

1.6 x 10 -5 V

Question number: 557

» Magnetic Effects of Current and Magnetism » Moving Coil Galvanometer

MCQ▾

Question

The sensitivity of a moving coil galvanometer can be increased by

(1) Decreasing the couple per unit twist of the suspension

(2) Increasing the number of turns in the coil

(3) Decreasing the area of the coil

(4) Decreasing the magnetic field

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

Choices

Choice (4) Response

a.

1 and 2 are correct

b.

1 and 3 are correct

c.

2 and 4 are correct

d.

1, 2 and 3 are correct

Question number: 558

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

MCQ▾

Question

What is the net force on the square coil?

Current carrying square coil ABCD

Current Carrying Square Coil ABCD

In figure 1 A current carrying a square coil is indicate and a conducting straight 2A current carrying wire placed beside it.

Choices

Choice (4) Response

a.

25 x 10 -7 N towards wire

b.

25 x 10 -7 N away from wire

c.

35 x 10 -7 N towards wire

d.

35 x 10 -7 N away from wire

Question number: 559

» Magnetic Effects of Current and Magnetism » Para, Dia and Ferro-Magnetic Substances

MCQ▾

Question

A diamagnetic material in a magnetic field moves

Choices

Choice (4) Response

a.

Perpendicular to the field

b.

From stronger to the weaker parts of the field

c.

From weaker to the stronger parts of the field

d.

None

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