Suppose you wanted to find the field of a circular loop (Ex. 5.6) at a point r that is not directly above the center (Fig. 5.61). You might as well choose your axes so that r lies in the yz plane at (0, y, z). The source point is (R cos Ф', R sin Ф', 0), and Ф' runs from 0 to 2π. Set up the integrals from which you could calculate Bx, By, and Bz, and evaluate Bx explicitly.

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X N R dľ' N