1. The problem statement, all variables and given/known data What is the net electric flux through the the torus if a=-6 nC and b=60 nC ? 2. Relevant equations Electric flux=Qin/E 3. 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.