(a) Evaluate the line integral of H about the rectangular path P1(2,3,4) to P2(4,3,4) to P3(4,3,1) to P4(2,3,1) to P1 given H = 3z ax - 2x3 az A/m.
(b) Determine the quotient of the closed line integral and the area enclosed by the path as an approximation to ( del x H)y.
(c)Determine (del x H)y at the center of the area.