Potential of a charged conductor

2014 AIPMT 1 question

1. 1 Electrostatic Potential and Capacitance
   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 Zero and $\frac{Q}{4\pi\varepsilon_0R^2}$ B $\frac{Q}{4\pi\varepsilon_0R}$ and Zero C $\frac{Q}{4\pi\varepsilon_0R}$ and $\frac{Q}{4\pi\varepsilon_0R^2}$ D Both are zero
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