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

  • question_answer
    A magnet of magnetic moment \[2\,J\,{{T}^{-1}}\] is aligned in the direction of magnetic field of 0.1 T. What is the net work done to bring the magnet normal to the magnetic field [DCE 2004]

    A)            0.1  J                                        

    B)            0.2 J

    C)            1 J  

    D)            2 J

    Correct Answer: B

    Solution :

               \[W=MB(1-\cos \theta )=2\times 0.1\times (1-\cos {{90}^{o}})=0.2J\]


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