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The electrostatic potential \( \left(\phi_{\mathrm{r}}\right) \) of a spherical symmetric system, kept at origin, is shown in the adjacent figure, and given as
\[
\begin{array}{c}
\phi_{\mathrm{r}}=\frac{\mathrm{q}}{4 \pi \in_{\mathrm{o}} r} \quad\left(r \geq R_{\mathrm{o}}\right) \\
\phi_{\mathrm{r}}=\frac{\mathrm{q}}{4 \pi \in_{\mathrm{o}} R_{\mathrm{o}}}\left(r \leq R_{\mathrm{o}}\right)
\end{array}
\]
\( \mathrm{P} \)
W
Which of the following option(s) is/are correct?
(A) For spherical region \( \mathrm{r} \leq \mathrm{R}_{\mathrm{o}} \), total electrostatic energy stored is zero.
- (B) Within \( r=2 R_{0} \), total charge is \( q \).
(C) There will be no charge anywhere except at \( r=R_{0} \).
(D) Electric field is discontinuous at \( \mathrm{r}=\mathrm{R}_{0} \).
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