Here's the problem that I have been trying to solve: A solid conducting sphere of radius 20cm is concentrically placed inside a spherical shell of inner radius 30 cm and outer radius 40cm. A Charge of 20uC is placed on the inner sphere, and a charge of -10uC is placed on the outer conductor. The dielectric constant of the medium between the 2 conductors is 5. Finc: a) D, E and P at all points in space (all vectors) b) the total energy in the system Can anyone help me resolve this . Thakn you.