Two long parallel wires, placed 4 cm apart, carry 1.80 A of a current in the opposite directions. Find the net magnetic field, magnitude and direction, generated by the pair (a) halfway between them, (b) 8cm to the left of one wire and (c) 4 cm to the right of the other. Use a diagram to clarify which wire is which and where you are calculating the field. Note that the direction will depend on your choice for the current's sense of flow in the wires. Make sure it's self consistent.