$A$ conducting sphere of radius $R$ is given a charge $Q$. The electric potential and the electric field at the centre of the sphere respectively are
- A$0, \frac{Q}{4\pi \varepsilon_0 R^2}$
- B$\frac{Q}{4\pi \varepsilon_0 R}, 0$
- C$\frac{Q}{4\pi \varepsilon_0 R}, \frac{Q}{4\pi \varepsilon_0 R^2}$
- D$0, 0$
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