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Question:

Three charged particles are collinear and are in equilibrium, then all the charged particle have the same polarity; all the charged particles cannot have the same polarity; the equilibrium is unstable; both (b) and (c) are correct.

all the charged particle have the same poarity

the equilibrium is unstable

all the charged particles cannot have the same polarity

both (b) and (c) are correct.

Solution:

If a charged particle is in equilibrium under electrostatic force, then that particle never be in stable equilibrium. Hence option B is correct. Since all charges are in equilibrium, net force an any one of the charges are in equilibrium, so net force an any one of charges should be zero - for this two equal and opposite forces will act on any charge. Hence option C is correct.