An isolated charge q1 of mass m is suspended freely by a thread of length l. Another charge q2 is brought near it….

Q. An isolated charge q1 of mass m is suspended freely by a thread of length l. Another charge q2 is brought near it (r >> l). When q1 is in equilibrium, tension in thread will be

(a) mg

(b) > mg

(c) < mg

(d) none of these

Ans: (b)