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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
- When a ceiling fan is switched on, it makes 10 revolutions in the first 3s
- Initial angular velocity of a circular disc of mass M is ?￢ﾂﾁ.Then, two small spheres
- In an interference experiment, third bright fringe is obtained at a point
- A small rod of bismuth is suspended freely between the poles of a strong electromagnet.
- A black body at 227⁰C radiates heat at the rate of 7cals/cm²s. At a temperature
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