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Two long straight parallel wires are 15 cm apart. Wire A carries 2.0-A current. Wire B’s current is 4.0 A in the same direction. (a) Determine the magnetic field due to wire A at the position of wire B. (b) Determine the magnetic field due to wire B at the position of wire A. (c) Are these two magnetic fields equal and opposite? Why or why not? (d) Determine the force per unit length on wire A due to wire B, and that on wire B due to wire A. Are these two forces equal and opposite? Why or why not?
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