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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
- The distance of the moon form the earth is 3.8×10⁵ km. Supposing that the eye
- A drum of radius R and mass M, rolls down without slipping along an inclined plane
- A body is thrown vertically up with a velocity u.It passes three points A,B and C
- A boy playing on the roof of a 10m high building throws a ball with a speed
- The ultimate individual unit of magnetism in any magnet is called
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