BHU PMT BHU PMT (Screening) Solved Paper-2009

  • question_answer
    Two equal and opposite charge (+ q and - q) are situated at x distance from each other, the value of potential at very far point will depend upon

    A)  only on q           

    B)  only on \[x\]

    C)  on\[qx\]                            

    D)  on \[\frac{q}{x}\]

    Correct Answer: C

    Solution :

                     Electric potential due to electric dipole at axial line\[{{E}_{axial}}=\frac{k(2qx)}{({{r}^{2}}-{{x}^{2}})}\]where r is the distance of observation point from centre of dipole. And for general point\[{{E}_{q}}=\frac{1}{4\pi {{\varepsilon }_{0}}}\frac{2qx\cos \theta }{{{r}^{2}}}\] So, the value of potential depends on\[qx\].


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