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  4. Two identical positive charges are placed on the y-axis at y=-a and y=+a. The variation of V (electric potential) along x-axis is shown by graph

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Q. Two identical positive charges are placed on the $y$-axis at $y=-a$ and $y=+a$. The variation of $V$ (electric potential) along $x$-axis is shown by graph

Electrostatic Potential and Capacitance

Solution:

image
$V=\frac{2 k q}{\sqrt{a^{2}+x^{2}}}$