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
AIPMT 2014, Easy
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For the conducting sphere,
Potential at the centre $=$ Potential on the sphere
$ = \frac{1}{{4\pi {\varepsilon _0}}}\frac{Q}{R}$
Electric field at the centre $=0$
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