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The wire has length l and carries a current I. A point P is located at a distance of lower r from the wire and perpendicular to the z axis. Upper R sub 2 is the distance between the one end of the wire and the point P. Upper R sub 1 is the distance between the other end of the wire and the point P. Theta sub 2 is an exterior angle between the side upper R sub 2 and the positive z axis. Theta sub 1 is an interior angle between the side upper R sub 1 and the wire.