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A point charge +Q is placed at the centroid of an equilateral triangle. When a second charge +Q is placed at a vertex of the triangle, the magnitude of the electrostatic force on the central charge is 8N. The magnitude of the net force(in N) on the central charge when a third charge +Q is placed at another vertex of the triangle is

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answer is 8.

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Detailed Solution

As the charges are identical the magnitude of force will be same

$R = \sqrt{8^{2} + 8^{2} + 2 \times 8 \times 8 \cos 120^{\circ}} = 8 N$
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