Two long straight wires are parallel and 8.0 cm apart. They are to carry equal currents

Chapter 29, Problem 9

(choose chapter or problem)

Two long straight wires are parallel and 8.0 cm apart. They are to carry equal currents such that the magnetic field at a point halfway between them has magnitude 300 mT. (a) Should the currents be in the same or opposite directions? (b) How much current is needed?

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