Application: Magnetic dipole. A small circular loop of radius a and a small, square loop, a x a are given.
(a) Calculate the magnetic dipole moment of the circular loop.
(b) Justify based on physical considerations the following statement: "At large distances, the magnetic dipole of the square loop is the same as that of a circular loop of identical area."
(c) Calculate the magnetic flux density at a general point in space due to each loop for the conditions in (b).