Q.

Three charged particles are in equilibrium under their electrostatic forces only.

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a

The particles must be collinear.

b

All the charges cannot have the same magnitude.

c

All the charges cannot have the same sign.

d

The equilibrium is unstable.

answer is A.

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Detailed Solution

Sign of q2 should be different from q1 and q3.
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Three charged particles are in equilibrium under their electrostatic forces only.