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

  • question_answer
    What is the potential energy of the equal positive point charges of \[1\mu C\] each held 1 m apart in air                [AMU 1999]

    A)            \[9\times {{10}^{-3}}J\]

    B)                                      \[9\times {{10}^{-3}}eV\]

    C)            \[2eV/m\]

    D)                                      Zero

    Correct Answer: A

    Solution :

                         By using \[U=9\times {{10}^{9}}\frac{{{Q}_{1}}{{Q}_{2}}}{r}\] Þ \[U=9\times {{10}^{9}}\times \frac{{{10}^{-6}}\times {{10}^{-6}}}{1}=9\times {{10}^{-3}}J\]


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