the xyplane), and the field produced by wire 2 (the wire at bottom right) is at φ= 210°. By symmetry GGBB12=diwe observe that only the x-components survive, yielding 50ˆˆ2cos150i( 3.46 10 T)i 2iBB Bµ−⎛⎞=+=°=− ×⎜⎟⎝⎠GG GAπwhere i= 10 A, A= 0.10 m, and Eq. 29-4 has been used. To cancel this, wire bmust carry current into the page (that is, the −±k direction) of value ()57022 (0.087 m)3.46 10 T15A410Tm/AbriBπ−−
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