Magnetic Effects of Current and Magnetism (NEET Physics): Questions 110 - 112 of 155

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Question number: 110

» Magnetic Effects of Current and Magnetism » Bar Magnet

MCQ▾

Question

A small magnet of magnetic moment 4A-m 2 is placed on a deflection magnetometer in tan-B position at a distance of 20 cm from the compass needle. At what distance from compass needle should another small magnet of moment 0.5 A-m 2 be placed such that the deflection of the needle remains zero?

Choices

Choice (4) Response

a.

12 cm

b.

30 cm

c.

10 cm

d.

20 cm

Question number: 111

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

Assertion-Reason▾

Assertion (Ꭺ)

The ferromagnetic substance does not obey Curie’s law.

Reason (Ꭱ)

At Curie point a ferromagnetic substance starts behaving as a paramagnetic substance.

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 true but Ꭱ is NOT the correct explanation of Ꭺ

c.

Ꭺ is true but Ꭱ is false

d.

Ꭺ is false but Ꭱ is true

Question number: 112

» Magnetic Effects of Current and Magnetism » Bar Magnet

MCQ▾

Question

Two magnets A and B are identical and these are arranged as shown in the figure. Their length is negligible in comparison to the separation between them. A magnetic needle is placed between the magnets at point P which gets deflected through an angle 0 under the influence of magnets. The ratio of distances d 1 and d 2 will be

Arrangement of two identical magnets A and B.

Arrangement of Two Identical Magnets a and B.

Two magnets A and B are identical and these are arranged as shown in the figure. Their length is negligible in comparison to the separation between them. A magnetic needle is placed between the magnets at point P.

Choices

Choice (4) Response

a.

(2 cot θ) -1/3

b.

(2 tan θ) 1/3

c.

(2 cot θ) 1/3

d.

(2 tan θ) -1/3

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