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JEE Main & Advanced Sample Paper JEE Main Sample Paper-35

  • question_answer
    The magnetic moment of a bar magnet is \[5\times {{10}^{-5}}\] web-m and it is being suspended in a magnetic field of \[8\times {{10}^{-4}}\]tesla. The time period of oscillation of magnet is 15 sec, the M.I. of the bar magnet (in kg-m2) will be:                 

    A)  \[22.5\]                              

    B)  \[11.25\]

    C)  \[5.62\]                              

    D)  \[0.57\]

    Correct Answer: D

    Solution :

    Since time period is \[T=2\pi \,\sqrt{\frac{I}{MB}}\]             \[I=\frac{TMB}{4{{\pi }^{2}}}\]           \[=\frac{1}{4{{\pi }^{2}}}\times 15\,\times 5\times {{10}^{-5}}\,\times 8\times {{10}^{-4}}\]


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