Question

Point charges +4q, - q and +4q are kept on the X -axis at point x = 0 and x = 2a respectively.

• A. only -q is in stable equilibrium
• B. all the charges are in stable equilbrium
• C. all of the charges are in unstable equilibrium
• D. none of the charges is in equilibrium

Answer 1

Answer: (C)

all of the charges are in unstable equilibrium

Answer 2

At the present position all the charges are in equilibrium. But when they displaced slightly from their present position, they do not return back. So, they are in unstable equilibrium position.