An electron is moving round the nucleus of a hydrogen atom in a circular orbit of radius `r`. The coulomb force `vec(F)` between the two is (where `k=(1)/(4piepsilon_(0)))`

Options

A. `k(e^(2))/(r^(3))r`
B. `-k(e^(2))/(r^(3))r`
C. `k(e^(2))/(r^(2))r`
D. `-k(e^(2))/(r^(3))hatr`

Answer

B