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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
- Penetrating power of X-rays does not depend on
- A circuit contains an ammeter, a battery of 30 V and a resistance 40.8 ohm
- Two solid discs of radii r and 2r roll from the top of an inclined plane
- A nucleus with mass number 220 initially at rest emits an α-particle. If the Q-value
- The wing span of an aeroplane is 20 m. It is flying in a field where the vertical
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