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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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- A 36 Ω galvanometer is shunted by resistance of 4 Ω. The percentage of the total current
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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 current in the coil of inductance 5H decreases at the rate of 2 A/s
- A 36 Ω galvanometer is shunted by resistance of 4 Ω. The percentage of the total current
- The induced emf in a coil of 10 H inductance in which current varies
- The maximum velocity of a particle, executing simple harmonic motion with an amplitude
- A charge of 40 µC is given to a capacitor having capacitance C=10 µF
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