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Charges $5 μC, - 2 μC, 3 μC$ and $- 9 μC$ are placed at the corners A, B, C and D of a square ABCD of side 1 m. The net electric potential at the centre of the square is

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-27KV

$- 27 \sqrt{2} KV$

-90KV

Zero

answer is B.

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Detailed Solution

$V = \frac{1}{4 π \in_{0} r} (q_{1} + q_{2} + q_{3} + q_{4}) \frac{1}{\sqrt{2}} m$

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