A bar magnet of magnetic moment M is freely suspended in a uniform magnetic field of intensity B. The work done in rotating the magnet by an angle A will be

Options :
  1. MB (1-sinA)
  2. MB sinA
  3. MB cosA
  4. MB (1-cosA)
Answer and Explanation :-

Answer: Option 4

Explanation:

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When the voice of your friend or the page of your book sinks into democratic equality with the pattern of the wallpaper, the feel of your clothes, your memory of last night, and the noises from the road, you are falling asleep. The highly selective consciousness enjoyed by fully alert men, with all its builded sentiments and consecrated ideals, has as much to be called real as the drowsy chaos, and more.
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