Question

The maximum charge that can be given to a conducting sphere [in mC] of radius 1m if the dielectric strength of air is $3\times {10}^6$ V/m. is

Answer 1

$E_{max}=3\times {10}^{6}V/mand{E}_{max}=\frac{kQ}{R^2}$
$\frac{9\times {10}^{9}Q}{1^2}=3\times {10}^6$ gives $Q=\frac{1}{3}\times {10}^{-3}$