A and B are two thin metallic spherical shells of radii 5cm and 10cm respectively. Shell A carries a charge of 10μC. Then electro static energy stored in the space outside shell B is

Induced charge on the outer surface of B=+10μe.So the electrostatic energy stored in the space outside the shell B is the energy produced by the charge on the outer surface of B.∴U=Q2ϑπεoR=(10×10-6)2×9×1092×0.1J=4.5 J