# NEET Physics: Questions 552 - 555 of 2142

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## Question number: 552

MCQ▾

### Question

If an electron is moving with velocity v in an orbit of radius r in a hydrogen atom, then the equivalent magnetic moment is

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 553

MCQ▾

### Question

A bar magnet with its poles 25 cm apart and of pole strength 24.0 A-m rests with its center on a frictionless pivot. A force F is applied on the magnet at a distance of 12 cm from the pivot, so that it is held in equilibrium at an angle of 30° with respect to a magnetic field of induction 0.25 T. The value of force F is

### Choices

Choice (4) Response

a.

6.25 N

b.

2.56 N

c.

65.62 N

d.

6.52 N

## Question number: 554

Assertion-Reason▾

### Assertion (Ꭺ)

The earth magnetic field due to iron present in the core.

### Reason (Ꭱ)

At very high temperature, iron is no longer ferromagnetic.

### Choices

Choice (4) Response

a.

Ꭺ is true but Ꭱ is false

b.

Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ

c.

Both Ꭺ and Ꭱ are false

d.

Ꭺ is false but Ꭱ is true

## Question number: 555

MCQ▾

### Question

The correct statements regarding the lines of force of the magnetic field B are

(1) Magnetic intensity is a measure of lines of force passing through unit area held normal to it

(2) Magnetic lines of force form a closed curve

(3) Due to a magnet magnetic lines of force never cut each other

(4) Inside a magnet, its magnetic lines of force move from North pole of a magnet towards its South pole

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

### Choices

Choice (4) Response

a.

1, 2 and 3 are correct

b.

1 and 2 are correct

c.

2 and 4 are correct

d.

1 and 3 are correct

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