Two parallel wires in a horizontal plane carry currents I₁ and I₂ to the right. The wires each have length L and are separated by a distance d. Find the magnitudes and directions of the 

(a) The magnetic field due to wire 1 at the location of wire 2, 

(b) The magnetic force on wire 2, 

(c) The magnetic field due to wire 2 at the location of wire 1, and 

(d) the magnetic force on wire 1. 

(e) Do parallel currents in the same direction attract or repel? What about parallel currents in opposite directions? 

(f) Are the magnitudes and directions of the forces consistent with Newton's third law?