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.
(a) What are the magnitude and direction of the field due to wire 1 at the location of wire 2?
(b) What are the magnitude and direction of the magnetic force on wire 2 due to this field?
(c) What are the magnitude and direction of the field due to wire 2 at the location of wire 1?
(d) What are the magnitude and direction of the magnetic force on wire 1 due to this field?
(e) Do parallel currents in the same direction attract or repel?
(f) What about parallel currents in opposite directions?