"A conductor consists of a circular loop of radius .0584 m and straight long sections. The wire lies in the plane of the paper and carries a current of 9.68 A. Determine the magnitude of the magnetic field at the center of the loop. Answer in units of T." ---------- Perhaps im not taking into account the long straight sections, but i believed that they did not affect the mag field at the center of the loop, correct? Anyway, using B = (u*I)/(2*pi*r), i got an incorrect answer. is this formula incorrect?