We see the electric field lines from the charge passing through the surface. The is called the electric flux, Φ, through the surface. How does the flux change when the charge moves? If we move the charge to the , to the , if we move it , or if we move it , as long as the charge remains within the surface the same fields lines cross the surface. Where the field lines cross the surface changes, but the same field lines cross the surface no matter where the charge is within the surface.