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MHT CET 2026 (20 Apr, Shift 1) · Electric Potential & Equipotentials

Electric Potential & Equipotentials question from MHT CET 2026 (20 Apr, Shift 1)

Q9MHT CET 2026 · 20 APR · SHIFT 1Medium

Electric Potential & Equipotentials

Four electric charges $+q, +q, -q$ , and $-q$ are placed in order at the corners of a square of side ' $2r$ '. The electric potential at a point midway between the two negative charges is

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Answer: (a)

Midpoint P of the side joining the two $-q$ : distance $r$ to each $-q$ .
Distance to each $+q$ : $\sqrt{(2r)^2 + r^2} = \sqrt5\,r$ .
$V = k\left[-\dfrac{2q}{r} + \dfrac{2q}{\sqrt5\,r}\right]$
$V = \dfrac{1}{4\pi\epsilon_0}\dfrac{2q}{r}\left[\dfrac{1}{\sqrt5} - 1\right]$
So the answer is (a).

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