An electron is moving round the nucleus ...

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)))`

`- K e^2 /r^3 hatr`

`K e^2/r^3 vecr`

`-K e^2/r^3 vecr`

`Ke^2/r^2 hatr`

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