A long pair of insulated wires serves to conduct 24.5 A of DC current to and from an instrument. If the wires are of negligible diameter but are 2.8 mm apart, what is the magnetic field 10 cm from their midpoint, in their plane? Note that "to and from" means the current is flowing in opposite directions in the wires. If the wires are drawn vertically, the current in the left wire (the one furthest from the 10 cm point) is traveling down and the other up. Compare to the magnetic field of the Earth.