Two small balls having equal positive charge Q,C each are supended by two insulating strings of equal length L meter form a hook fixed to a stand . The whole set up is taken to a satellite in space where there is no gravity.Calculate the angle between the two strings and the tension in each string.

Options

A. `180^(@), (1)/(4 pi epsilon_(0)) (Q^(2))/((2L)^(2))`
B. `90^(@), (1)/(4 pi epsilon_(0)) (Q^(2))/(L^(2))`
C. `180^(@), (1)/(4 pi epsilon_(0)) (Q^(2))/(2L^(2))`
D. `180^(@), (1)/(4 pi epsilon_(0)) (Q^(2))/(L^(2))`

Answer

A

Explanation

In the absence of gravitational force, the only force acts on the spheres is electrostatic repulsion and so the angle between two suspension becomes ` 180^(@)` . So
`F = (1)/( 4 pi epsilon_(0)) (Q^(2))/( (2 L)^(2))` .