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A coil of wire has 500 turns per meter and carries a current of 25 mA....

A coil of wire has 500 turns per meter and carries a current of 25 mA. A long, straight wire runs down the center of the coil and carries the same current, 25 mA. (a) How far from the long, straight wire is the magnetic field due to that wire the same magnitude as the magnetic field due to the coil? (b) At that point, how do the directions of those two magnetic fields compare?
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