It can be measured via an effect first analyzed by Ehrenberg and Siday, whose names are sometimes attached to that effect.
It can be measured via an effect first analyzed by Ehrenberg and Siday, whose names are sometimes attached to that effect. The canonical momentum for a charged particle is equal to the ordinary momentum plus the charge over c times this quantity. The D'Alembertian of this quantity is equal to minus the permeability times the current density according to one of Maxwell's equations.  One is free to add the gradient of a scalar function to this quantity in classical electrodynamics, while according to quantum mechanics, its value can be measured with the Aharanov-Bohm effect.  Its divergence is set to zero in the Coulomb gauge.  FTP, name this quantity whose curl is equal to the magnetic field.
It can be measured via an effect first analyzed by Ehrenberg and Siday, whose names are sometimes attached to that effect.
{magnetic potential}  or magnetic {vector potential}  (DO NOT accept or prompt on "potential")