two parallel wires are carrying electric current of equal magnetic magnitude in the same direction they exert (a) an attractive force on each other (b) no force on each other (c) a repulsive force on each other (d) a rotational torque on each other
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The official definition of the ampere is: One ampere of current through each of two parallel conductors of infinite length, separated by one meter in empty space free of other magnetic fields, causes a force of exactly 2×10−7N/m on each conductor
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