NEET Physics: Questions 646 - 649 of 2098

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Question number: 646

» Magnetic Effects of Current and Magnetism » Bar Magnet

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.

5.0 x 10 6 A/m

b.

1.2 x 10 6 A/m

c.

2.0 x 10 6 A/m

d.

3.0 x l0 6 A/m

Question number: 647

» Magnetic Effects of Current and Magnetism » Para, Dia and Ferro-Magnetic Substances

MCQ▾

Question

Among the following properties describing diamagnetism identify the property that is wrongly stated.

Choices

Choice (4) Response

a.

The magnetic moment of individual electrons neutralize each other

b.

Diamagnetic material does not have permanent magnetic moment

c.

Diamagnetism is explained in terms of electromagnetic induction.

d.

Diamagnetic materials have a small positive susceptibility

Question number: 648

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

MCQ▾

Question

A circular current carrying coil has a radius R. The distance from the center of the coil on the axis where the magnetic, induction will be 18 to its value at the center of the coil, is

Choices

Choice (4) Response

a.

5×10 -3 tesla

b.

5×10 -4 tesla

c.

2×10 -3 tesla

d.

5×10 -2 tesla

Question number: 649

» Magnetic Effects of Current and Magnetism » Hysteresis

MCQ▾

Question

Which of the following statements are correct about hysteresis?

(1) This effect is common to all ferromagnetic substances

(2) The hysteresis loop area is proportional to the thermal energy developed per unit volume of the material

(3) The shape of the hysteresis loop is characteristic of the material

(4) The hysteresis loop area is independent of the thermal energy developed per unit volume of the material

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

Choices

Choice (4) Response

a.

1 and 3 are correct

b.

2 and 4 are correct

c.

1, 2 and 3 are correct

d.

1 and 2 are correct

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