JCECE Medical JCECE Medical Solved Paper-2014

  • question_answer The couple acting on a magnet of length 10 cm and pole strength 125 A-m, kept in a field of \[B=2\times {{10}^{-5}}T,\]at an angle of \[{{30}^{o}}\] is

    A) \[1.5\times {{10}^{-5}}N-m\]

    B)  \[1.5\times {{10}^{-3}}N-m\]

    C)  \[1.5\times {{10}^{-2}}N-m\]

    D)  \[1.5\times {{10}^{-6}}N-m\]

    Correct Answer: A

    Solution :

     \[C=MB\sin \theta \] \[=(m\times 2l)\times 2\times {{10}^{-5}}\sin {{30}^{o}}\] \[=150\times {{10}^{-2}}\times 2\times {{10}^{-5}}\times \frac{1}{2}=1.5\times {{10}^{-5}}N-m\]

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