The figure below shows four very long wires all perpendicular to the xy plane. Wire #1 passes through the origin and has current I1 = 75 A coming out...

The figure below shows four very long wires all perpendicular to the xy plane. Wire #1 passes through the origin and has current I1 = 75 A coming out of the page. Wire #2 passes through the point (−1 m, 1 m) and has current I2 = 25 A going into the page. Wire #3 passes through the point (2 m, 1 m) and has current I3 = 50 A, also going into the page.

The fourth wire passes through the point (3 m, 4 m) and has current I = 40 A coming out of the page. Determine the magnitude of the force per length on the fourth wire due to wires #1, #2 and #3.