A particle of charge `-q` and mass `m` moves in a circular orbits of radius `r` about a fixed charge `+Q`.The relation between the radius of the orbit `r` and the time period `T` is

Options

A. `r=(Qq)/(16pi^2 in_0 m) T^2`
B. `r^3=(Qq)/(16pi^3 in_0 m) T^2`
C. `r^2=(Qq)/(16pi^3 in_0 m) T^3`
D. `r^2=(Qq)/(4pi^3 in_0 m) T^3`