Two long, straight wires are separated by 0.120 m. The wires carry currents of 9

Question

Two long, straight wires are separated by 0.120 m. The wires carry currents of 9.9 A in opposite directions, as the drawing indicates. Find the magnitude of the net magnetic field at the points labeled (a) A and (b) B.

http://edugen.wileyplus.com/edugen/courses/crs6407/art/qb/qu/c21/ch21p_72.gif

Two long, straight wires are separated by 0.120 m. The wires carry currents of 9.9 A in opposite directions, as the drawing indicates. Find the magnitude of the net magnetic field at the points labeled (a) A and (b) B.

Explanation / Answer

B = ?0/(2?) (Current) / (Perpendicular distance)
Since ?0=4? E -7 Tm/A, we have:
B1 = (4?E-7 Tm/A)(9.9 A)/[2? (0.030 m)] =
B2 = (4?E-7 Tm/A)(-9.9 A)/[2? (0.150 m)] =

add b1 and b2

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