Question
Force between the two parallel wires carrying currents has been used to define:
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Answer
Ampere is defined as the constant current that will produce an attractive force of $2\times 10^{−7}$ newton per metre of length between two straight, parallel conductors $($carrying the constant current$)$ of infinite length and negligible circular cross section placed one metre apart in a vacuum. This is the Ampere's Force Law.
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