5. Find the electrostatic potential V(x,y,z) at the point (x,y,z)=(3,2,1) from the two electric field distributions given in problem 1 a. and b., given that the potential at the origin V(0,0,0)=0.
Hint: use line integrals starting at the origin and going along x first from (0,0,0) to (3,0,0), then along y from (3,0,0) to (3,2,0), then along z to reach (3,2,1).