# NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 572 - 575 of 2320

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## Question number: 572

Edit
MCQ▾

### Question

current of 1.0 ampere is flowing in the sides of an equilateral triangle of side 4.5 x 10 -2 m. Find the magnetic field at the centroid of the triangle.

(Permeability constant . )

### Choices

Choice (4)Response

a.

6.0 x 10 -8 weber/m 2

b.

4.0 x 10 -5 weber/m 2

c.

2.0 x 10 -5 eber/m 2

d.

7.0 x 10 -12 weber/m 2

## Question number: 573

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MCQ▾

### Question

The length of a bar magnet is 10 cm and its pole strength is 10 -3 Weber. It is placed in a magnetic field of induction 4 π x 10 -3 Tesla in a direction making an angle 30° with the field direction. The value of torque acting on the magnet will be -

### Choices

Choice (4)Response

a.

0.5 x 10 2 N-m

b.

2 π x 10 -5 N-m

c.

None

d.

2 π x 10 -7 N-m

## Question number: 574

Edit
Assertion-Reason▾

### Assertion (Ꭺ)

The coil is bound over the metallic frame in moving coil galvanometer.

### Reason (Ꭱ)

The metallic frame help in making steady deflection without any oscillation.

### Choices

Choice (4)Response

a.

Ꭺ is true but Ꭱ is false

b.

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

c.

Both Ꭺ and Ꭱ are false

d.

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

## Question number: 575

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MCQ▾

### Question

Which of the following is the most suitable for the core of electromagnets?

### Choices

Choice (4)Response

a.

Copper-nickel alloy

b.

Air

c.

Soft iron

d.

Steel

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