$A$ thin spherical shell is charged by some source. The potential difference between the two points $C$ (the center) and $P$ (a point on the surface) as shown in the figure is: (Take $\frac{1}{4 \pi \varepsilon_0} = 9 \times 10^9 \text{ SI units}$)
- A$1 \times 10^5 \text{ V}$
- B$0.5 \times 10^5 \text{ V}$
- CZero
- D$3 \times 10^5 \text{ V}$
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