1. The problem statement, all variables and given/known data http://home.phys.ntnu.no/brukdef/undervisning/tfy4155/ovinger/Ov03.pdf Hi. Take a look at the picture under assignment 2 ("oppgave 2"). Let's say there is a charge +q inside the cavity of the conducting metal ball. The problem is: "How will (free) charge be distributed when the system is in an electrostatic equilibrium? Draw the field-lines for the electrostatic field E. Find an expression for E outside the sphere". 2. Relevant equations Gauss' law 3. The attempt at a solution I know from Gauss' law the electric field is 0 inside the solid part of the ball. I also know -q charge will accumulate at the edge of the cavity close to the q charge, and +q charge will again accumulate on the edges of the ball. So my questions are: 1) Will the electric field be at its strongest in the lower part of the figure? 2) Will the electric field be like that around a point charge +q, inside the cavity? Ie, will the field lines go radially outwards from q inside the cavity?