force of attraction between nucleus and an electron is given by??

Suppose there are x protons and x electrons
then force of attraction is given by
F=K.(xq)^2/(r^2)
where r is the orbit radius 

there is electrostatic force between protons in nucleus and electrons in orbits

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No. There is electromagnetic energy, like light and radio, and even the gamma rays being emitted by the broken reactor in Japan.

But the attraction between oppositely charged objects is electrostatic.