Three point charges are placed at the corners of an equilateral triangle. Assuming only electrostatic forces are acting.

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The system can never be in equilibrium

The system will be in equilibrium if the charges have different magnitudes and different signs.

The system will be in equilibrium if the charges rotate about the centre of the triangle.

The system will be in equilibrium if the charges have the same magnitude but different signs.

answer is A.

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Detailed Solution

Three charged particles are in equilibrium under their electrostatic forces only when the particles are on the same line (i.e., collinear). All the charges cannot have the same magnitude and same sign.

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