Question: Two round concentric metal wires lie on a tabletop, one inside the other. The inner wire has a diameter of 1 8 . 0 cmcm

Two round concentric metal wires lie on a tabletop, one inside the other. The inner wire has a diameter of

18.0

cmcm and carries a clockwise current of

20.0

,

as viewed from above, and the outer wire has a diameter of

36.0

.

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?

Express your answer in amperes.

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