A) all the charged particles have the same polarity
B) the equilibrium is unstable
C) all the charged particles cannot have the same polarity
D) Both (b) and (c) are correct
Correct Answer: D
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 so, net force an any one of charges are in equilibrium so, net force an any one of charges should be zero-for this two equal and opposite fores will act on any charges. Hence option(c) is correct.
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