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  3. MGIMS WARDHA

MGIMS WARDHA MGIMS WARDHA Solved Paper-2005

  • question_answer
    A small circular flexible loop of wire of radius '    r' cories a current \[I.\] It is placed in a uniform magnetic field B. The tension in the loop will   be doubled if :

    A) \[I.\] is doubled

    B) B is halved

    C) r is doubled

    D) both B and \[I.\] are doubled

    Correct Answer: D

    Solution :

    Force acting on the loop is given by \[F=MB\sin \theta \] and        \[M=IA\]                 \[=I.\pi {{r}^{2}}\] So, tension will be doubled if\[I\]is doubled.


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