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JEE Main & Advanced Physics Magnetism Question Bank Self Evaluation Test - Magnetism and Matter

  • question_answer
    A magnet of magnetic moment \[50\hat{i}\,\,A-{{m}^{2}}\]is placed along the x-axis in a magnetic field\[\overset{\to }{\mathop{B}}\,=(0.5\hat{i}+3.0\hat{j})T\]. The torque acting on the magnet is

    A) \[175\,\hat{k}\,N-m\]     

    B)        \[150\,\hat{k}\,N-m\]

    C) \[75\,\hat{k}\,N-m\]      

    D)        \[25\sqrt{37}\,\hat{k}\,\,N-m\]

    Correct Answer: B

    Solution :

    [b] \[\overset{\to }{\mathop{\tau }}\,=\overset{\to }{\mathop{M}}\,\times \overset{\to }{\mathop{B}}\,=50\hat{i}\times (0.5\hat{i}+3\hat{j})=150\,\hat{k}\,N-m\]


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