NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 638 - 642 of 2142

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Question number: 638

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

MCQ▾

Question

A superconductor exhibits perfect

Choices

Choice (4) Response

a.

Diamagnetism

b.

Paramagnetic

c.

Ferrimagnetism

d.

Ferromagnetism

Question number: 639

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

MCQ▾

Question

A straight horizontal copper wire carries a current i = 30 A. The linear mass density of the wire is 45 g/m. What is the magnitude of the magnetic field needed to balance its weight?

Choices

Choice (4) Response

a.

0 Gauss

b.

147 Gauss

c.

441 Gauss

d.

14.7 Gauss

Question number: 640

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

MCQ▾

Question

A particle having charge q, mass m and kinetic energy E, enters a magnetic field B normally. It will oscillated with frequency equal to,

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 641

» Magnetic Effects of Current and Magnetism » Hysteresis

MCQ▾

Question

The mass of a specimen of a ferromagnetic material is 0.6 kg and its density is 7.8 x 10 3 kg/m 3. If the area of hysteresis loop of alternating magnetizing field of frequency 50Hz is 0.722 MKS units then the hysteresis loss per second will be

Choices

Choice (4) Response

a.

27.77 x 10 -4 Joule

b.

277.7 x 10 -6 Joule

c.

277.7 x 10 -5 Joule

d.

277.7 x 10 -4 Joule

Question number: 642

» Magnetic Effects of Current and Magnetism » Bar Magnet

Assertion-Reason▾

Assertion (Ꭺ)

Gauss theorem is not applicable in magnetism.

Reason (Ꭱ)

Mono magnetic pole does not exist.

Choices

Choice (4) Response

a.

Both Ꭺ and Ꭱ are false

b.

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

c.

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

d.

Ꭺ is true but Ꭱ is false

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