Given the electric field E = 1/z2 (8xyz ax + 4x2z ay - 4x2y az) V/m, find the differential amount of work done in moving a 6 nC charge a distance of 2 µm, starting at P(2, -2, 3) and proceeding in the direction:
aL = - 6/7ax+ 3/7 ay + 2/7 az
aL= + 6/7ax - 3/7 ay - 2/7 az
3/7 ax + 6/7 ay