Volt is not a unit of an electric field. Talking about '50 volts' is complete nonsense in a context of an electric field. Also, a magnetic field around a wire will establish if there is a moving charge inside the wire, which can be established with any voltage -- as long as there is current, which is measured in ampere. Electric charge is measured in coulomb and magnetic fields are given in tesla -- so there cannot be a connection if they talk about 'volt'.

I am not saying there isn't any link but I am saying that 'volt' is surely the wrong connection, so this should be taken with utmost caution.