The potential at a distance $R/2$ from the centre of a conducting sphere of radius $R$ will be
- A$0$
- B$\frac{Q}{8\pi \varepsilon_0 R}$
- C$\frac{Q}{4\pi \varepsilon_0 R}$
- D$\frac{Q}{2\pi \varepsilon_0 R}$
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