Two long straight wires are parallel and 6.5 cm apart. They are to carry equal currents such that the magnetic eld at a point halfway
Two long straight wires are parallel and 6.5 cm apart. They are to carry equal currents such that the magnetic eld at a point halfway between them has magnitude 400 uT. (a) Should the currents be in the same or opposite directions? (b) How much current is needed
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