Thanks for your help. I think I understand. Here's my steps:
Differentiating the function for charge to find the charge inside a thin layer of the shell of thickness dr:
Q = E4πr²\epsilonₒ
dQ/dr = 8πrE\epsilonₒ
Finding the volume of a thin spherical shell of thickness dr: (between "r"...
Homework Statement
Consider a spherical shell with inner radius r1=0.30 m and outer radius r2=1.00 m. The hollow inside the shell contains no charge; and charge is distributed on the inside surface of the shell and within the shell itself, such that the electrical field inside the shell itself...