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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
- Which of the following measurement is most precise?
- The energy of groundstate (n=1) of hydrogen level is -13.6 eV. The ionistation
- Three unequal resistors in parallel are equivalent to a resistance 1 Ω.
- Perfectly black body radiates the energy 18 J/s at 300K. Another ordinary body of e=0.8
- One mole of an ideal gas at an initial temperature of T K, does 6R joule of work
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