D7.3. Express the value of H in rectangular components at P(0, 0.2, 0) in the field of: (a) a current filament, 2.5 A in the a, direction at x = 0.1, y = 0.3; (b) a coax, centered on the z axis, with a = 0.3, b = 0.5, c = 0.6, I = 2.5 A in the a, direction in the center conductor; (c) three current sheets, 2.7a, A/m at y = 0.1, -1.4a, A/m at y = 0.15, and -1.3a, A/m at y = 0.25. Ans. 1.989ax-1.989a, A/m; -0.884a, A/m; 1.300a, A/m