Magnetic Effects of Current and Magnetism-Current Loop as Magnetic Dipole (NEET Physics): Questions 23 - 25 of 25

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Question number: 23

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

MCQ▾

Question

A rectangular loop carrying a current i is placed in a uniform magnetic field B, The area enclosed by the loop is A. If there are n turns in the loop, the torque acting on the loop is given by

Choices

Choice (4) Response
a.

1n(iAB)

b.

1n(iA×B)

c.

niAB

d.

niA×B

Question number: 24

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

MCQ▾

Question

wire of length L has magnetic moment M. It is bent in to semicircular arc. The new magnetic moment is,

Choices

Choice (4) Response
a.

M2L

b.

2ML

c.

2Mπ

d.

ML

Question number: 25

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

MCQ▾

Question

A current of 30 A is flowing in a vertical straight wire. If the horizontal component of earth’s magnetic field is 2 x 10 -5 tesla then the distance of null point from wire is –

Choices

Choice (4) Response
a.

0.3 m

b.

0.3 cm

c.

0.3 mm

d.

0.9 m

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