Three charges 2q, -q and -q are located at the vertices of an equilateral triangle. At the centre of the triangle (a) the field is zero but potential is not zero (b) the field is not zero but potential is zero (c) both field and potential are zero (d) both field and potential are not zero

Answer: (b). All vertices are at the same distance r from the centre. V = k/r(2q - q - q) = 0 Field: 2q gives 2E₀ away from its vertex; the two -q give E₀ each towards their vertices, which add to E₀ also directed away from the 2q vertex. Enet = 3E₀ ≠ 0 So the answer is (b) the field is not zero but potential is zero.

Three charges 2q, -q and -q are located at the vertices of an… | MHT CET 2026 (13 May, Shift 2)

Q8MHT CET 2026 · 13 MAY · SHIFT 2Medium

Electric Potential & Equipotentials

Three charges $2q, -q$ and $-q$ are located at the vertices of an equilateral triangle. At the centre of the triangle

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Answer: (b)

All vertices are at the same distance $r$ from the centre.
$V = \dfrac{k}{r}(2q - q - q) = 0$
Field: $2q$ gives $2E_0$ away from its vertex; the two $-q$ give $E_0$ each towards their vertices, which add to $E_0$ also directed away from the $2q$ vertex.
$E_{net} = 3E_0 \neq 0$
So the answer is (b) the field is not zero but potential is zero.

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Electric Potential & Equipotentials question from MHT CET 2026 (13 May, Shift 2)

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