Fundamentals of Engineering Electromagnetics 1st Edition by David Cheng

Exercise 29

Refer to Problem P.4-3.
a) Calculate the time it takes for the charge density in the sphere to diminish to 1% of its initial value.
b) Calculate the change in the electrostatic energy stored in the sphere as the charge density diminishes from the initial value to 1% of its value. What happens to this energy
c) Determine the electrostatic energy stored in the space outside the sphere. Does this energy change with time