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The value of workdone for rotating a magnet of magnetic moment M by an angle θ in external magnetic field H is given by
Options
(a) MH cos θ
(b) 2MH sin²(θ/2)
(c) MH sin θ
(d) MH (1-sin²θ)
Correct Answer:
MH cos θ
Explanation:
MH (1 – cos θ) = work done
.·. W = MH [1 – 1 + 2 sin² (θ / 2)] = 2MH sin² (θ / 2)
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Topics: Magnetic Effects of Current and Magnetism
(167)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- In the equation y=asin(?t+kx),the dimensionals formula of ? is
- A boat of mass 40 kg is at rest.A dog of mass 4 kg moves in the boat
- Two discs of same material and thickness have radii 0.2 m and 0.6 m.
- In the middle of the depletion layer of a reverse-biased P-N junction, the
- A short magnet of magnetic moment M, is placed on a straight line. The ratio
Topics: Magnetic Effects of Current and Magnetism (167)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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B is the right option