A hollow sphere of radius 1m is given a positive charge of $10 \mu C$. The electric field at the centre of hollow sphere will be :

Question

$\begin{array}{1 1} (1)\; 60 \times 10^{3} Vm^{-1} \\ (2)\; 90 \times 10^3 Vm^{-1} \\ (3)\; Zero \\ (4)\; Infinite \end{array}$