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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 optical path of a monochromatic light is same if it goes through 4.0 cm
- A stone of mass 1 kg tied to a light inexensible string of length L=10/3 is whirling
- The sun light reaches us as white and not as its components because
- The earth radiates in the infrared region of the spectrum. The spectrum is correctly
- The transition from the state 3 n = 3 to n = 1 in a hydrogen like atom results
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