Two round concentric metal wires lie on a tabletop, one inside the other. The inner wire has a diameter of $22\mathrm{.}0$ cm and carries a clockwise current of $13\mathrm{.}0$ A $,$ as viewed from above, and the outer wire has a diameter of $36\mathrm{.}0$ 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 clockwise.The current's direction must be counterclockwise.