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NEET Sample Paper NEET Sample Test Paper-27

  • question_answer
    A magnet of magnetic moment M is rotated through \[{{360}^{o}}\] in a magnetic field H, the work done is:

    A)  \[MH\]                        

    B)  \[2MH\]

    C)  \[27\pi MH\]               

    D)  zero

    Correct Answer: D

    Solution :

    From the relation, Work done \[=-MH\,(\cos {{\theta }_{f}}-\cos {{\theta }_{i}})\] \[W=MH\,(\cos {{360}^{o}}-\cos {{0}^{o}})\] W = zero


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