Electric field problems

Statement-1 : A changing electric field produces a magnetic field Statement-2: A changing magnetic field produces an electric field.

Coulomb's Law and its application| Electric field|Electric field intensity|Electric field lines

For the following electric field lines, the the electric field is

In the above problem, find the electric field and electric potential at the centre of the sphere due to induced charges on the sphere?

Electric Field Lines||Electric Field||Properties OF Electric Field

Consider the situation of the previous problem. Find the average electric field energy stored in the capacitor and the average magnetic field energy stored in the coil.