Two round concentric metal wires lie on a tabletop, one inside the other. The in

Question

Two round concentric metal wires lie on a tabletop, one inside the other. The inner wire has a diameter of 18.0 cm and carries a clockwise current of 12.0 A, as viewed from above, and the outer wire has a diameter of 40.0 cm. What must be the direction (as viewed from above) of the current in the outer wire so that the net magnetic field due to this combination of wires is zero at the common center of the wires? The current's direction must be counterclockwise. What must be the magnitude of the current in the outer wire so that the net magnetic field due to this combination of wires is zero at the common center of the wires? I = A

Explanation / Answer

PartB)

For magnetic field to be 0 at the center

B1 = B2

iinner / rinner = iouter / router

12/0.09 = iouter / 0.20

iouter = 26.7 A

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