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12th Class Physics Electrostatics & Capacitance Question Bank Case Based (MCQs) - Electric Potential and Capacitance

  • question_answer
    The mutual electrostatic potential energy between two protons which are at a distance of \[9\times {{10}^{-15}}m\], in \[_{92}{{U}^{235}}\] nucleus is

    A) \[1\centerdot 56\times {{10}^{-14}}J\]

    B) \[5\centerdot 5\times {{10}^{-14}}J\]

    C) \[2\centerdot 56\times {{10}^{-14}}J\]

    D) \[4\centerdot 56\times {{10}^{-14}}J\]

    Correct Answer: C

    Solution :

    Here, \[{{q}_{1}}={{q}_{2}}=1\,.\,6\times {{10}^{-19}}C\], \[r=9\times {{10}^{-15}}\,m\] \[=9\times {{10}^{9}}\times \frac{1\,.\,6\times {{10}^{-19}}\times 1\,.\,6\times {{10}^{-19}}}{9\times {{10}^{-15}}}\] \[=2\,\,.\,56\times {{10}^{-14}}\,J\]


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