Consider an atom with atomic number $Z$ as consisting of a positive point charge at the centre and surrounded by a distribution of negative electricity uniformly distributed within a sphere of radius $R$. The electric field at a point inside the atom at a distance $r$ from the centre is
Consider an atom with atomic number $Z$ as consisting of a positive point charge at the centre and surrounded by a distribution of negative electricity uniformly distributed within a sphere of radius $R$. The electric field at a point inside the atom at a distance $r$ from the centre is
- A
$\frac{ Ze }{4 \pi \varepsilon_0}\left[\frac{1}{r^2}-\frac{r}{R^3}\right]$
- B
$\frac{Z e}{4 \pi \varepsilon_0}\left[\frac{1}{r^2}+\frac{1}{R^3}\right]$
- C
$\frac{2 Z e}{4 \pi \varepsilon_0 r^2}$
- D
$0$
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