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JEE Main & Advanced Physics Magnetism Question Bank Magnet and its Properties

  • question_answer
    The work done in rotating a magnet of magnetic moment 2 A-m2 in a magnetic field of 5 ´ 10?3 T from the direction along the magnetic field to opposite direction to the magnetic field, is                                    [MP PET 2003]

    A)            Zero                                         

    B)            2 ´ 10?2 J

    C)            10?2 J                                       

    D)            10 J

    Correct Answer: B

    Solution :

                       \[W=MB(1-\cos \theta );\]where \[\theta ={{180}^{o}}\]            \[\Rightarrow W=2MB\Rightarrow W=2\times 2\times 5\times {{10}^{-3}}=2\times {{10}^{-2}}J\]


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