Two circular concentric metal wires lie on a tabletop, one inside the other. The inner wire...
Two circular concentric metal wires lie on a tabletop, one inside the other. The inner wire has a diameter of 21.0 cm and carries a clockwise current of 18.0 A , as viewed from above, and the outer wire has a diameter of 34.0 cm .
A) 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?
B) 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?
C) If the current in the outer wire was the same in magnitude as the current in the inner wire, but in the opposite direction, what would be the magnitude of the magnetic field due to these wires at their common center?
D) In what direction (with respect to the tabletop) is the magnetic field found in part C?
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