Need help with practice problem

The two wires shown in the figure carry currents of 5 A and 10A in the opposite direction and are separated by 10 cm. Find: 1- The magnitude and the direction of the magnetic field at the midway between the two wires (at point A). 2- If a proton (q=1.6x10-19 C) passes point A with a speed of 3x10 m/s in the direction shown. Find the magnitude and the direction of the magnetic force acting on the proton. 3- The magnitude and the direction of the magnetic force per unit length between the two wires. V=3x105 m/s |1=10A 12=5A A -- q=1.6x10-19 C