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JEE Main & Advanced Physics Electrostatics & Capacitance Question Bank Electric Field and Potential

  • question_answer
    A charge produces an electric field of 1 N/C at a point distant 0.1 m  from it. The magnitude of charge is                                                                                                [RPET 2002]

    A)                    \[1.11\times {{10}^{-12}}\,C\]

    B)                                      \[9.11\times {{10}^{-12}}\,C\]

    C)                    \[7.11\times {{10}^{-6}}\,C\]

    D)                                      None of these

    Correct Answer: A

    Solution :

                 \[E=9\times {{10}^{9}}\frac{Q}{{{r}^{2}}}\]Þ \[Q=\frac{E\times {{r}^{2}}}{9\times {{10}^{9}}}=\frac{1\times {{(0.1)}^{2}}}{9\times {{10}^{9}}}=1.11\times {{10}^{-12}}C\]


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