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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: - An electric dipole is placed at an angle 30°with an electric field intensity 2×10⁵N/C.
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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
- An electric dipole is placed at an angle 30°with an electric field intensity 2×10⁵N/C.
- Unit of electrical conductivity is
- If, an electron in hydrogen atom jumps from an orbit of level n=3 to an orbit
- In the phenomenon of electric discharge through gases at low pressure,
- Two capacitors of 10pF and 20pF are connected to 200V and 100V sources, respectively.
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