Question

Two small balls having equal positive charge Q (coulumb) on each suspended by two insulating strings of equal length L (metre) from a hook fixed to a stand. The whole set-up is taken in a satellite into space where there is no gravity (state of weightlessness). Then tension (newtons) in each string is:
A. `(Q^(2))/(4piin_(0)L^(2))`
B. `(Q^(2))/(8piin_(0) L^(2))`
C. `(Q^(2))/(12 pi in_(0)L^(2))`
D. `(Q^(2))/(16 pi in_(0)L^(2))`

Answer 1

Correct Answer - D
Since, there is no gravity in a space statellite, so electrostatic repultion force (only) acts on two charges which is balanced by tension in strings.