NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 644 - 647 of 2184

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Question number: 644

» Magnetic Effects of Current and Magnetism » Current Loop as Magnetic Dipole

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MCQ▾

Question

A rectangular coil of size 20 cm x 20 cm has 100 turns and carries a current of 1 A. It is placed in a uniform magnetic field B = 0.5 T with the direction of magnetic field parallel to the plane of the coil. The magnitude of the torque required to hold this coil in this position is

Choices

Choice (4) Response

a.

2 Nm

b.

200 Nm

c.

10 Nm

d.

Zero

Question number: 645

» Magnetic Effects of Current and Magnetism » Current Loop as Magnetic Dipole

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MCQ▾

Question

The ( ) graph for a current carrying coil placed in a uniform magnetic field is

Choices

Choice (4) Response

a.

Graph of torque τ→θ (option A)

Graph of Torque Τ→Θ (Option A)

Figure shows the graph of torque τ→θ. It is not liner.

b.

Graph of torque τ→θ (option B)

Graph of Torque Τ→Θ (Option B)

Figure shows the graph of torque τ→θ. It is not liner.

c.

Graph of torque τ→θ (option C)

Graph of Torque Τ→Θ (Option C)

Figure shows the graph of torque τ→θ. It is liner.

d.

Graph of torque τ→θ (option D)

Graph of Torque Τ→Θ (Option D)

Figure shows the graph of torque τ→θ. It is not liner.

Question number: 646

» Magnetic Effects of Current and Magnetism » Moving Coil Galvanometer

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MCQ▾

Question

A moving coil galvanometer has N number of turns in a coil of effective area A. It carries a current I. The magnetic field B is radial. The torque acting on the coil is

Choices

Choice (4) Response

a.

NABi

b.

NA 2 B 2 i

c.

N 2 ABi

d.

NABi 2

Question number: 647

» Magnetic Effects of Current and Magnetism » Bar Magnet

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MCQ▾

Question

A bar magnet made of steel has a magnetic moment of 2.5 A-m 2 and a mass of 6.6 x 10 3 kg. If the density of steel is 7.9 x 10 9 kg/m 3, find the intensity of magnetization of the magnet.

Choices

Choice (4) Response

a.

2.0 x 10 6 A/m

b.

5.0 x 10 6 A/m

c.

3.0 x l0 6 A/m

d.

1.2 x 10 6 A/m