Three charged particles are collinear and are in equilibrium, then

Options

A. all the charged particles have the same polarity
B. the equilibrium in unstable
C. all the charged particles cannot have the same polarity
D. both (a) and (c ) are correct

Answer

B, C

Explanation

When three charged particles are collinear and are in equilibrium, then a small displacement of one charged particle from its position will make the system of charges unstable. Thus, the option (b) is true.
Since all charges are in equilibrium, so net force on any of charges in equilibrium is zero. It will be so if two equal and opposite forces act on every charge . It will be so if the three charged particles do not have the same plartity. Thus, option (c) is true.