NEET Physics: Questions 569 - 573 of 2098

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Question number: 569

» Magnetic Effects of Current and Magnetism » Electric Charge Moving in Magnetic Field

MCQ▾

Question

A l m long conducting wire is lying at right angles to the magnetic field. A force of 1 kg weight is acting on it in a magnetic field of 0.98 tesla. The current flowing in it will be,

Choices

Choice (4) Response

a.

10 A

b.

100 A

c.

1A

d.

0

Question number: 570

» Magnetic Effects of Current and Magnetism » Electric Charge Moving in Magnetic Field

MCQ▾

Question

In the example above, after how much time, particle comes to the starting point for the first time, (mass of particle = m)

Choices

Choice (4) Response

a.

2πm3qB

b.

Never

c.

It will leave the circular path before coming to the starting point

d.

2πmqB

Question number: 571

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

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 μ0=4π×107N/A2 . )

Choices

Choice (4) Response

a.

2.0 x 10 -5 eber/m 2

b.

7.0 x 10 -12 weber/m 2

c.

6.0 x 10 -8 weber/m 2

d.

4.0 x 10 -5 weber/m 2

Question number: 572

» Magnetic Effects of Current and Magnetism » Bar Magnet

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.

2 π x 10 -5 N-m

b.

None

c.

0.5 x 10 2 N-m

d.

2 π x 10 -7 N-m

Question number: 573

» Magnetic Effects of Current and Magnetism » Moving Coil Galvanometer

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.

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

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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