There are two long and perpendicular wires, forming a cross-like structure. There is an electric current flowing in the directions shown in the diagram. The r1=8.9 m and the r2=6.8 m, and the net magnetic field at A=3.476 x 10^-5 T and B=4.957 x 10^-5 T. Both magnetic fields are in the same direction and due to the currents.
What is the current (I2) in the second and horizontal wire?