In Fig. $29-42,$ two long straight wires are perpendicular to the page and separated by distance $d_{1}=0.75 \mathrm{cm}$ . Wire 1 carries 6.5 $\mathrm{A}$ into the page. What are the (a) magnitude and (b) direction (into or out of the page) of the current in wire 2 if the net magnetic field due to the two currents is zero at point $P$ located at distance $d_{2}=1.50 \mathrm{cm}$ from wire 2$?$