Spherical capacitor problem help

[mopar969]

I need help on starting and solving this problem. See attachment for problem.

 

[ideasrule]

Do you know Gauss' law?

 

[mopar969]

yes.

 

[ideasrule]

yes.

In that case, use Gauss' law to attempt this problem, and post your attempt here. We can't just give you the answers without some effort on your part towards a solution.

 

[mopar969]

I know that gauss law says q over epsilon zero but how do I incorporate this for the dielectric material?

 

[mopar969]

I know that the electric field for a dielectric is e = Q all over 4 pi k epsilon zero r^2. I also know that the electric field for the innerest conductor can be found using E = 1 over 4 pi epsilon zero time Q over r^2. Using this equation I got 3.25 x 10 ^ -9. However I do not know how to solve the outer most shell given with the charge per volume value. And for my dielectric electric field formula how do I get the er value of 1.8 that was given in the problem into the equation?

 

[mopar969]

Anybody have a way to solve this problem?