It concerns a controversy regarding Ampere's original formulation of the basic magnetic force law between current elements.
Apparently he was persuaded to this version because it obeys N3 even in the strong form (equal and opposite "central" forces).
This is contrary to the traditional force law, which comes from the Biot Savart relation and the Lorentz QVxB force.
Examples of experimental evidence for the Ampere longitudinal force component are cited. Should these results be attributed to an other-than-magnetic component of the force between current elements?
Could the original Ampere magnetic force law possibly be reconciled with Maxwell's equations and the Lorentz force?