What Is the Correct Charge to Use for Calculating Electric Flux in a Torus?

[jincy34]

Homework Statement

What is the net electric flux through the the torus if a=-6 nC and b=60 nC ?

Homework Equations

Electric flux=Qin/E

The Attempt at a Solution

I solved with Qin being 6*10^-9 C as it is the charge inside and E0=8.85*10^-12. I got 678 for electric flux. But it is wrong.

 

[G01]

$$\epsilon_0 = 8.85*10^{-12}$$ not $$8.85*10^{-9}$$.

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[jincy34]

I put the right value for E0. But, I am not sure if the charge I am using is right or not. Is the charge inside 60nC, 6nC or net charge?

 

[G01]

I put the right value for E0. But, I am not sure if the charge I am using is right or not. Is the charge inside 60nC, 6nC or net charge?

Is the +60nC charge contained inside the surface of the solenoid?