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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)
Related Questions: - The wavelength of the short radio waves, microwaves, ultraviolet waves are λ₁,λ₂ and λ₃
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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 wavelength of the short radio waves, microwaves, ultraviolet waves are λ₁,λ₂ and λ₃
- A transformer rated at 10 kW is used to connect a 5 kV transmission line to a 240 V
- A body of mass (4m) is lying in x-y plane at rest. It suddenly explodes into three
- A 36 Ω galvanometer is shunted by resistance of 4 Ω. The percentage of the total current
- Force required to move a mass of 1kg at rest on a horizontal rough plane
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