# NEET Physics: Questions 544 - 547 of 2142

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## Question number: 544

MCQ▾

### Question

A conducting circular loop of radius r carries a constant current i. It is placed in a uniform magnetic field B, such that B is perpendicular to the plane of the loop. The magnetic force acting on the loop is

### Choices

Choice (4) Response

a.

zero

b.

c.

d.

## Question number: 545

MCQ▾

### Question

A circular coil of radius 4 cm has 50 turns. In this coil a current of 2 A is flowing. It is placed in a magnetic field of 0.1 weber/m 2. The amount of work done in rotating it through 180° from its equilibrium position will be

### Choices

Choice (4) Response

a.

0.1 J

b.

0.8 J

c.

0.4 J

d.

0.2 J

## Question number: 546

Assertion-Reason▾

### Assertion (Ꭺ)

If an electron is not deflected while passing through a certain region of space, then only possibility is that there is no magnetic region.

### Reason (Ꭱ)

Magnetic force is directly proportional to the magnetic field applied.

### Choices

Choice (4) Response

a.

Ꭺ is false but Ꭱ is true

b.

Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ

c.

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

d.

Ꭺ is true but Ꭱ is false

## Question number: 547

Assertion-Reason▾

### Assertion (Ꭺ)

For a charged particle to pass through a uniform electro-magnetic field without change in velocity, its velocity vector must be perpendicular to the magnetic field.

### Reason (Ꭱ)

Net Lorentz force on the particle is given by

### Choices

Choice (4) Response

a.

Ꭺ is true but Ꭱ is false

b.

Both Ꭺ and Ꭱ are false

c.

Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ

d.

Ꭺ is false but Ꭱ is true

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