Two long, straight wires are separated by 0.12 m. The wires carry currents of 8.0 A in opposite directions, as the drawing indicates.

Question

(a) Find the magnitude of the net magnetic field at the point A.
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(b) Find the magnitude of the net magnetic field at the point B.
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Answer 1

B=μ0I/2πr

B1 = (4π×10^7)(8.0A)/(2π×0.030m)
B2 = (4π×10^7)(-8.0A)/(2π×0.150m)
BA = B1 + B2

B1 = (4π×10^7)(8.0A)/(2π×0.060m)
B2 = (4π×10^7)(-8.0A)/(2π×-0.060m)
BB = B1 + B2

Answer 2

This math is correct except that u0 = [(4)(pi)]x10^-7, not positive 7. Otherwise, thanks for your work.