A charge $1.2×10^{-8}C$ is uniformly distributed on the conducting sphere of radius 5 cm. The magnitude of the electric field at the centre of the conducting sphere is

zero

The correct answer is Option (3) → zero

For a conducting sphere, the electric field inside the conductor (including at the centre) is zero by Gauss's Law :

$\vec{E}_{\text{inside}} = 0$

Electric field at the centre = 0 N/C