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NEET Sample Paper NEET Sample Test Paper-76

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

    A)  0                                

    B)  2 MH               

    C)  - MH                           

    D)  -2 MH

    Correct Answer: A

    Solution :

    \[\operatorname{W}=-MH\left( cos{{\theta }_{f}}-\,\,cos{{\theta }_{i}} \right)\] \[=-MH\,\left( cos360{}^\circ -cos\,\,0{}^\circ  \right)=0\]


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