NEET Sample Paper NEET Sample Test Paper-50

  • question_answer 40) An arbitrary shaped closed coil is made of a wire of length L and a current I ampere is flowing in it. If the plane of the coil is perpendicular to magnetic filed \[\overrightarrow{B}\], the force on the coil is-

    A) Zero                 

    B) IBL

    C) 2IBL                            

    D) \[\frac{1}{2}\,IBL\]

    Correct Answer: A

    Solution :

    \[F=BI\,\,({{\ell }_{i}}-{{\ell }_{f}})\] Here \[{{\ell }_{i}}-{{\ell }_{f}}\,=\,0\] for loop

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