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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 radii of circular orbits of two satellites A and B of the earth, are 4R and R
- An unpolarised beam of intensity I is incident on a pair of nicols making an angle
- In a n-p-n transistor about 10¹⁰ electrons enter the emitter in 2 μs,
- A heavy stone hanging from a massless string of length 15 m is projected
- A photon of energy 10.2 eV collide inelastically with hydrogen atom in ground state
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