Electrostatics Question 391
Question: Point charges $ +4q,-q $ and $ +4q $ are kept on the $ x- $ axis at points $ x=0,x=a $ and $ x=2a $ respectively, then [CBSE PMT 1992]
Options:
A) Only $ q $ is in stable equilibrium
B) None of the charges are in equilibrium
C) All the charges are in unstable equilibrium
D) All the charges are in stable equilibrium
Show Answer
Answer:
Correct Answer: C
Solution:
Force on each charge is zero. But if any of the charge is displaced, the net force starts acting on all of them.
