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MHT CET 2025 (20 Apr, Shift 1) · Electrostatic Potential Energy

Electrostatic Potential Energy question from MHT CET 2025 (20 Apr, Shift 1)

Q25MHT CET 2025 · 20 APR · SHIFT 1Medium

Electrostatic Potential Energy

Three point charges $+Q, +2Q$ and $q$ are placed at the vertices of an equilateral triangle. The value of charge $q$ in terms of $Q$ , so that electrical potential energy of the system is zero, is given by

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Answer: (c)

Equal separations, so the sum of charge products must be zero.
$Q(2Q) + Qq + 2Qq = 0 \Rightarrow 2Q + 3q = 0$
$q = -\dfrac{2}{3}Q$ . So the answer is (c).

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