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AMU Medical AMU Solved Paper-1999

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

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

    B)  \[9\times {{10}^{-3}}eV\]

    C)  \[1J\]                 

    D)  zero

    Correct Answer: A

    Solution :

    : Potential energy \[=\frac{1}{4\pi {{\varepsilon }_{0}}}\frac{{{q}_{1}}{{q}_{2}}}{r}\] \[=(9\times {{10}^{9}})\times \frac{{{10}^{-6}}\times {{10}^{-6}}}{1}J\] \[=9\times {{10}^{-3}}J\]


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