# Electric Fields in Solid Sphere and Thick Shell

1. May 20, 2007

### SmokeDragoon

1. The problem statement, all variables and given/known data
What is the electric field at r1, r2, r3 for a solid sphere within a thick spherical shell where r1=1.5cm, r2=5.0cm, r3=8.0cm? The solid sphere has a total charge of 3C and the thick shell has a charge of -9C. a=2.0cm, b=4.0cm, c=6.0cm.

not sure how to calculate/what happens to the electric field when r1 is inside a and b > r3 > c.
they are insulating sphere and shell.

2. Relevant equations
$$\int_ \vec E. d\vec A = q_\text{enclosed}/\epsilon_0$$
Eo = 8.85 * 10^ -12

3. The attempt at a solution
I solved r3 by using a gaussian surface and using the total charge as a whole.
So then,
EA = q enclosed/Eo
E (4pi(.06)^2) = -6/8.85*10^-12
got E = -1.5*10^13

Last edited: May 20, 2007