For 10 points— identify this quantity whose curl gives the magnetic field.
This quantity multiplies the electric charge in the full relativistic formulation of the linear  momentum, and it is integrated over the path to find the phase difference in the (*) Aharonov-Bohm effect. Setting its divergence to zero yields the Coulomb gauge, and in the relativistic Maxwell equations, this quantity provides the last three components of the 4-potential. For 10 points— identify this quantity whose curl gives the magnetic field.
This quantity multiplies the electric charge in the full relativistic formulation of the linear  momentum, and it is integrated over the path to find the phase difference in the (*) Aharonov-Bohm effect.
vector potential