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MHT CET 2026 (17 Apr, Shift 2) · Electrostatic Potential Energy

Electrostatic Potential Energy question from MHT CET 2026 (17 Apr, Shift 2)

Q10MHT CET 2026 · 17 APR · SHIFT 2Medium

Electrostatic Potential Energy

Three point charges +q, +2q and +Q are placed at the vertices of an equilateral triangle. If the potential energy of the system of three charges is zero, the value of Q in terms of q is

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Answer: (b)

All three pairs are at the same distance, so the sum of charge products must be zero.
$q(2q) + qQ + 2qQ = 0 \Rightarrow 2q + 3Q = 0$
$Q = -\dfrac{2q}{3}$ . So the answer is (b).

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