The figure shows wire 1 in cross section; the wire is long and straight, carries a current of 4.04 mA out of the page, and is at distance $d_1$ = 2.65 cm from a surface. Wire 2, which is parallel to wire 1 and also long, is at horizontal distance $d_2$ = 5.03 cm from wire 1 and carries a current of 6.88 mA into the page. What is the x component of the magnetic force per unit length on wire 2 due to wire 1?