Evaluate the electrical voltage from the magnetic field (mf) physic

Hi !

I need to calculate the electrical voltage of an electric conductor subdued to a magnetic field.

The conductor is excited by a current density using magnetic field physic (mf). I want to simulate the electric voltage V (in volts) resulting from that but I can't find the way to do so. I can't find the expression of the potential V in the simulation outputs.
How can one evaluate the V using the mf physic please ?

Thanks for your help