A) The third charge experiences a net force inclined to the line joining the charges
B) The third charge is in stable equilibrium
C) The third charge is in unstable equilibrium
D) The third charge experience a net force perpendicular to the line joining the charges
Correct Answer: C
Solution :
The net force on the third charge is zero. However, when disturbed, the middle charge cannot return to the state of equilibrium. Because, the net force will not be zero anywhere except the mid-point.
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