If this existed, it would play the same role as electric charge for the electric field. Two parallel conductors carrying current in the same direction attract each other. The Ampere is that current which, if maintained in two straight parallel conductors of negligible radius and infinite length, placed one metre apart in a vacuum, will produce a force of newtons per meter of length. This definition will eventually be replaced by just 'so many electron charges per second'.
New technology allows single electrons to be counted.
Ampere's Law provides an alternative formulation of the relation between a magnetic field and its sources. In fact, this is the integral form of the Biot-Savart Law. Examples of Ampere's law Now suppose several long, straight conductors pass through the surface bounded by the integration path. Charges moving in the magnetic field cause a force opposing motion. The induced current is always in a direction such that the change in flux caused by it opposes the change in flux that produces it.