Two long straight parallel wires separated by d2 = 9.4 cm carry currents of equa

Question

Two long straight parallel wires separated by d2 = 9.4 cm carry currents of equal magnitude but heading in opposite directions. The wires are shown perpendicular to the plane of this page. Point P is d1 = 1.7 cm from wire 1, and the magnetic field at point P is 1.1 10-2 T directed in the ?y-direction. Calculate the current in wire 1 and its direction.

Two long straight parallel wires separated by d2 = 9.4 cm carry currents of equal magnitude but heading in opposite directions. The wires are shown perpendicular to the plane of this page. Point P is d1 = 1.7 cm from wire 1, and the magnetic field at point P is 1.1 10-2 T directed in the ?y-direction. Calculate the current in wire 1 and its direction.

Explanation / Answer

B = i/2 (1/d1 + 1/(d2-d1))

1.1e-2 = 2e-7*i * (1/1.7e-2 + 1/(9.4e-2-1.7e-2))

i = 766 A

into the page

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