NEET Physics: Questions 582 - 586 of 2099

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Question number: 582

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

MCQ▾

Question

The magnitude of magnetic field at a point having perpendicular distance 50 mm from a long straight conducting wire carrying a current of 3A is, ( μ0=4π×107 )

Choices

Choice (4) Response
a.

0.12 G

b.

1.2 G

c.

0.012 G

d.

12 G

Question number: 583

» Magnetic Effects of Current and Magnetism » Earth's Magnetic Field

Assertion-Reason▾

Assertion (Ꭺ)

A compass needle when placed on the magnetic north pole of the earth cannot rotate in vertical direction.

Reason (Ꭱ)

The earth has only horizontal component of its magnetic field at the north poles.

Choices

Choice (4) Response
a. Ꭺ is false but Ꭱ is true
b. Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ
c. Ꭺ is true but Ꭱ is false
d. Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ

Question number: 584

» Magnetic Effects of Current and Magnetism » Bar Magnet

MCQ▾

Question

A short magnet of length 4 cm is kept at a distance of 20 cm to the east of a compass box such that is axis is perpendicular to the magnetic meridian. If the deflection produced is 45°, find the pole strength (H = 30 Am -1)

Choices

Choice (4) Response
a.

17.7 Am

b.

37.7 Am

c.

44.2 Am

d.

27.7 Am

Question number: 585

» Magnetic Effects of Current and Magnetism » Bar Magnet

MCQ▾

Question

A north pole of strength 50 Am and South Pole of strength 100 Am are separated by a distance of 10 cm in air. Find the force between them.

Choices

Choice (4) Response
a.

20 x 10 -6 N

b.

25 x 10 -3 N

c.

30 x 10 -18 N

d.

50 x 10 -3 N

Question number: 586

» Electromagnetic Induction & Alternating Currents » Faraday's Law

MCQ▾

Question

When a small piece of wire passes between the magnetic poles of a horse-shoe magnet in 0.1 sec, emf of 4 x 10 -3 volt is induced in it. The magnetic flux between the poles is,

Choices

Choice (4) Response
a.

4 x 10 -3 weber

b.

4 x l0 -4 weber

c.

4 x 10 -6 weber

d.

4 x l0 -2 weber

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