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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)))`

A

`-K e^(2)/r^(3) hat(r)`

B

`K e^(2)/r^(3) vec(r)`

C

`-K e^(2)/r^(3) vec(r)`

D

`-K e^(2)/r^(2) hat(r)`

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