# NEET Physics: Questions 581 - 585 of 2142

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## Question number: 581

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, ()

### Choices

Choice (4) Response

a.

0.12 G

b.

1.2 G

c.

0.012 G

d.

12 G

## Question number: 582

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: 583

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: 584

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: 585

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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