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

  • question_answer
    A magnet of magnetic moment 20 C.G.S. units is freely suspended in a uniform magnetic field of intensity 0.3 C.G.S. units. The amount of work done in deflecting it by an angle of 30o in C.G.S. units is                           [MP PET 1991]

    A)            6    

    B)            \[3\sqrt{3}\]

    C)            \[3(2-\sqrt{3)}\]                 

    D)            \[3\]

    Correct Answer: C

    Solution :

                       Work done \[W=M{{B}_{H}}\left( 1-\cos \theta  \right)\]            \[=20\times 0.3\left( 1-\cos 30{}^\circ  \right)=6\left( 1-\frac{\sqrt{3}}{2} \right)=3\left( 2-\sqrt{3} \right)\]


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