Magnetic Effects of Current and Magnetism-Bar Magnet (NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics): Questions 22 - 25 of 27

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Question number: 22

» 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

Question number: 23

» Magnetic Effects of Current and Magnetism » Bar Magnet

MCQ▾

Question

A 10 cm long bar magnet of magnetic moment 1.34 Am 2 is placed in the magnetic meridian with its south pole pointing geographical south. The neutral point is obtained at a distance of 15 cm from the center of the magnet. Calculate the horizontal component of earth’s magnetic field.

Choices

Choice (4) Response

a.

0.21 x 10 -4 T

b.

0.12 x 10 -4 T

c.

0.87 x 10 -7 T

d.

0.34 x 10 -4 T

Question number: 24

» Magnetic Effects of Current and Magnetism » Bar Magnet

MCQ▾

Question

Calculate magnetic induction at a distance of 20 cm from a pole of strength 40 Am in air.

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 25

» Magnetic Effects of Current and Magnetism » Bar Magnet

MCQ▾

Question

A magnet of moment M is lying in a magnetic field of induction B. W 1 is the work done in turning it from 0° to 60° and W 2 is the work done in turning it from 30° to 90°.

Choices

Choice (4) Response

a.

b.

c.

d.

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