Two small balls, each having charge q, are suspended by two insulating threads of equal length L fron a hook in an elevator. The elevator is freely falling. Calculate the angle etween the two threads and tension in each thread.

Explanation

Because of the free fall, there will be weightlessness in the elevator. The balls will go maximum away from each other and finally angle between them will be `180^(@)`.

Repulsion force F between them will be balanced by tension T. so
`T=F=(1)/(4 pi epsilon_(0))(q^2)/((2L)^(2))=(q^2)/(16 pi epsilon_(0)L^(2))`.