Problem 8.5 (a) Ex = Ey = 0, Ez = -o/60. Therefore 02 02 Tay = Tiz = Ty= = ...= 0; Tix = Tyy = F2 = E2 = EO F2 = 02 0 OO = O O +1 (b) F = $ T . da (S = 0, since B = 0); integrate over the ry plane: da = -didy z (negative because outward with respect to a surface enclosing the upper plate). Therefore 02 F 02 F2 = | Tzz daz = 260 A, and the force per unit area is f = Z. A 2co