... current is out of the page 13 Each of the semi-infinite straight wires contributes µ 0i πR (Eq 2 9-7 ) to the field at the center of the circle (both contributions pointing “out of the page”) The... noting that the nearest wire-segments (each of length a) produce magnetism into the page at P and the further wire-segments (each of length 2a) produce magnetism pointing out of the page at P Thus,... the use of the right-hand rule) leads us to conclude that when wire is at angle θ2 (shown in Fig 2 9-5 4) then its components are B2x = B2 sinθ2, B2y = –B2 cosθ2 The magnitude-squared of their