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RAJASTHAN PMT Rajasthan - PMT Solved Paper-2011

  • question_answer
    Work done in moving a charge Q from the point   B(x = a, y = 0)   to   the   point A(x = 0, y = a) in the field of charge +q at origin is

    A)  zero                                     

    B) \[\frac{qQ}{4\pi {{\varepsilon }_{0}}(\sqrt{2}a)}\]

    C) \[\frac{qQ}{4\pi {{\varepsilon }_{0}}(2a)}\]         

    D)        \[\frac{qQ\sqrt{2}a}{4\pi {{\varepsilon }_{0}}}\]

    Correct Answer: A

    Solution :

                    \[{{W}_{B\to A}}=Q({{V}_{A}}-{{V}_{B}})\] but         \[{{V}_{A}}={{V}_{B}}\] \[\therefore \]  \[W=0\]


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