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

  • question_answer
    If \[1\mu C\]charge is shifted from A to B and it is found that work done by an external force is \[40\,\,\mu J\]. In doing so against electrostatics force, the potential difference \[{{V}_{A}}-{{V}_{B}}\] is

    A) 40V

    B) - 40V

    C) 20V

    D) - 60V

    Correct Answer: B

    Solution :

    \[{{W}_{ext}}={{q}_{0}}\Delta V\] \[{{\left( {{W}_{AB}} \right)}_{ext}}=q\left( {{V}_{B}}-{{V}_{A}} \right)\] \[40\,\mu J=1\,\mu C\left( {{V}_{B}}-{{V}_{A}} \right)\] \[{{V}_{A}}-{{V}_{B}}=-\,40\,V\]


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