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According to early model of an atom,the ...

According to early model of an atom,the atom is considered it to have a positively charged point nucleus of charge `Ze` surrounded by a uniform density of negative charge up to a radius `R`. The atom as a whole is neutral. The electric field at a distance`r` from the nucleus is `(r lt R)`

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For `r le R, E=E_("nucleus")+E_("electron distnibution")=("Ze")/(4pi epsilon_(0)r^(2))-("Zer")/(4pi epsilon_(0)R^(3))=("Ze")/(4pi epsilon_(0))[(1)/(r^(2))-( r )/(R^(3))]`
For `r ge R, E=0`
(Net charge enclosed by Gaussian surface = 0)
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