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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)
Related Questions: - Photons with energy 5eV are incident on a cathode C in a photoelectric cell.
- If the image formed by a convex mirror of focal length 30 cm is a quarter of the size
- Charge q is uniformly spread on a thin ring of radius R. The ring rotates
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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
- Photons with energy 5eV are incident on a cathode C in a photoelectric cell.
- If the image formed by a convex mirror of focal length 30 cm is a quarter of the size
- Charge q is uniformly spread on a thin ring of radius R. The ring rotates
- Two bodies A and B having temperature 327° C and 427° C are radiating heat
- what is the electric potential at a distance of 9cm from 3nC?
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