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An isolated sphere of radius $R$ contains uniform volume distribution of positive charge. Which of the curves shown below correctly illustrates the dependence of the magnitude of the electric field of the sphere as a function of the distance $r$ from its centre ?
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The correct answer is:
II
When $\mathrm{r} < \mathrm{R}$
$\mathrm{E}=\frac{\rho \mathrm{r}}{3 \in_{0}}$
When $r>R$
$\mathrm{E}=\frac{\mathrm{Q}}{4 \pi \in_{0} \mathrm{r}^{2}}$
$\mathrm{E}=\frac{\rho \mathrm{r}}{3 \in_{0}}$
When $r>R$
$\mathrm{E}=\frac{\mathrm{Q}}{4 \pi \in_{0} \mathrm{r}^{2}}$
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