$A$ hollow conducting sphere of radius $R$ carries a charge $(+Q)$ on its surface. Find the electric potential at a distance $r = R/3$ from its center.
- AZero
- B$\frac{1}{4\pi \varepsilon_0} \frac{Q}{r}$
- C$\frac{1}{4\pi \varepsilon_0} \frac{Q}{R}$
- D$\frac{1}{4\pi \varepsilon_0} \frac{Q}{r^2}$
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