Two similar balloons filled with helium gas are tied to `L m` long string. A body of mass `m` is tied to another ends of the strings. The balloons float on air at distance `r`. If the amount of charge on the ballons is same then the magnitude of charge on each balloon will be

Options

A. `[(mgr^(2))/(2k)tantheta]^(1//2)`
B. `[(2k)/(mgr^(2))tantheta]^(1//2)`
C. `[(mgr)/(2k)cottheta]^(1//2)`
D. `[(2k)/(mgr)tantheta]^(1//2)`

Answer

A