Physics - Electrostatics Question with Solution | TestHub

A cone made of insulating material has a total charge $\mathrm{Q}=3\mathrm{mC}$ spread uniformly over its sloping surface. Calculate the energy (in Joule) required to take a charge $\mathrm{q}=5\mu \mathrm{C}$ from infinity to apex A of cone. (Given : half cone angle $\theta =37^{\circ },R=2\mathrm{m}$ )