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JEE Main & Advanced Physics Magnetism Question Bank Magnet and its Properties

  • question_answer
    Force between two unit pole strength placed at a distance of one metre is                                          [CPMT 1987]

    A)            1 N

    B)            \[\frac{{{10}^{-7}}}{4\pi }N\]

    C)            \[{{10}^{-7\,}}\,N\]           

    D)            \[4\pi \times {{10}^{-7}}N\]

    Correct Answer: C

    Solution :

               \[F={{10}^{-7}}\times \frac{{{m}^{2}}}{{{r}^{2}}}=\frac{{{10}^{-7}}{{\left( 1 \right)}^{2}}}{{{\left( 1 \right)}^{2}}}={{10}^{-7}}N\]


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