P.6-13 For the small rectangular loop with sides a and b that carries a current I, shown in Fig. 6-32: a) Find the vector magnetic potential A at a distance point, P(x, y, z). Show that it can be put in the form of Eq. (6-45). b) Determine the magnetic flux density B from A, and show that it is the same as that given in Eq. (6-48). P(x, y, z) Fig. 6-32 A small rectangular loop carrying current / (Problem P.6-13).