1. The problem statement, all variables and given/known data 2. Relevant equations Gauss 3. The attempt at a solution I am really confused with question a, I have an idea of how to answer b and c once I obtain an answer for part a... My best guess would be to use Gauss, but I am not sure. Would the field inside be 0? What will the bounds of integration be when I integrate to find the charge, right now I get a charge of 2pi(a^3)? I am working on my solution and will post a picture when I get something useful, but can someone explain? Thank you.