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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 electric field part of an electromagnetic wave in a medium is represented by
- For a simple pendulum performing simple harmonic motion, the time period
- If a magnet is suspended at an angle 30⁰ to the magnetic meridian, the dip needle
- A filament bulb (500W,100V) is to be used in a 230V main supply. When a resistance
- A stone of mass 1 kg tied to a light inexensible string of length L=10/3 is whirling
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