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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 velocity of electromagnetic radiation in a medium of permittivity ε₀
- There are four light-weight-rod samples A,B,C,D seperately suspended by threads
- A person holding a rifle (mass of person and rifle together is 100 kg) stands on a smooth
- A boat of mass 40 kg is at rest.A dog of mass 4 kg moves in the boat
- The electirc field in a certain region is acting radially outward and is given by E=Ar.
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