1. The problem statement, all variables and given/known data Three charges with values + 20 μC, -10 μC and -10 μC are placed at the corners of a 0.10m square, as shown. c) Consider a sphere of radius 0.3m which totally encloses all three charges. Using Gauss's law derive an expression for the flux through this surface. 2. Relevant equations Electric flux = ƩQ/ε0 3. The attempt at a solution I don't get it, isn't Gauss's law by itself an expression for finding the electric flux (which I think should be 0)? I think it may have something to do with the non-uniform distribution of charge making Gauss's law by itself inadequate for the calculation, but I really have absolutely no idea what I'm supposed to do.