Physics - Electrostatics Question with Solution | TestHub

Dielectric strength means the maximum electric field which a medium can bear. Here, if field becomes more than this, then the charge will start leaking from the metal ball. So,

$E=\frac{kQ}{R^2} \Rightarrow Q=\frac{E{R}^2}{k}=\frac{3\times {10}^6\times {\left(0.001\right)}^2}{9\times {10}^9}=\frac{1}{\mathrm{3 }}\mathrm{nC}$