ch29-p067 - 67. (a) By the right-hand rule, the magnetic...

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the xy plane), and the field produced by wire 2 (the wire at bottom right) is at φ = 210°. By symmetry G G BB 12 = di we observe that only the x -components survive, yielding 5 0 ˆˆ 2 cos150 i ( 3.46 10 T)i 2 i BB B µ ⎛⎞ =+= °= − × ⎜⎟ ⎝⎠ GG G A π where i = 10 A, A = 0.10 m, and Eq. 29-4 has been used. To cancel this, wire b must carry current into the page (that is, the ± k direction) of value () 5 7 0 2 2 (0.087 m) 3.46 10 T 15A 41 0Tm / A b r iB π
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