1. The problem statement, all variables and given/known data Three fixed point charges of +2 nC, −3 nC and +4 nC are located inside a thin uncharged metal spherical shell of radius R = 2 cm, as shown in the picture attached. Calculate the strength and direction of the electric field at position P, being 10 cm from the centre of the shell. 2. Relevant equations E=Q/(4πε0r^2) 3. The attempt at a solution I'm not sure what to do with this one. By Gauss' law the total enclosed charge of the metal sphere must be zero, but then how would one proceed with the question and calculate the field on P due to the charges in the sphere? Thanks.