Magnetic Effects of Current and Magnetism (NEET Physics): Questions 138 - 143 of 152

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Passage

Read the passage given below and answer the questions that follows:

A charge particles q enters in a magnetic field B=yi^+xj^ with the velocity v=xi^+yj^ . Neglect any force other than magnetic force. Now answer the following question.

Question number: 138 (1 of 3 Based on Passage) Show Passage

» Magnetic Effects of Current and Magnetism » Electromagnets and Permanent Magnets

MCQ▾

Question

Magnetic force F acting on charge is proportional to –

Choices

Choice (4) Response

a.

Fx2+y2

b.

F(x2y2)

c.

F does not depend on x or y co-ordinate

d.

F(x2+y2)

Question number: 139 (2 of 3 Based on Passage) Show Passage

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

MCQ▾

Question

Which of the following is true for the direction of magnetic force?

Choices

Choice (4) Response

a.

If x > y then force works along (-z) direction

b.

If x < y then force works along (+z) direction

c.

If x > y then force works along (+z) direction

d.

None

Question number: 140 (3 of 3 Based on Passage) Show Passage

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

MCQ▾

Question

When particle arrives at any point P (2, 2) then force acting on it, will be -

Choices

Choice (4) Response

a.

Zero

b.

42q

c.

8q

d.

2 2q

Question number: 141

» Magnetic Effects of Current and Magnetism » Bar Magnet

MCQ▾

Question

A magnet of moment M is lying in a magnetic field of induction B. W 1 is the work done in turning it from 0° to 60° and W 2 is the work done in turning it from 30° to 90°.

Choices

Choice (4) Response

a.

W2=W12

b.

W2=2W1

c.

W2=W1

d.

W2=3W1

Question number: 142

» 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: 143

» 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

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