Physics

Problem

Three charges, each of

+q

, are placed at the vertices of an equilateral triangle. The charge needed at the in centre of the triangle for the charges to be in equilibrium is (a)

-\frac{q}{\sqrt{3}}

(b)

+\frac{q}{\sqrt{3}}

(c)

+\sqrt{3}q

(d)

-\sqrt{3}q

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