Uttarakhand PMT Uttarakhand PMT 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. 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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