Gw mau tau (2) Electric convection current dari Médan magnétik. Jelasin dalam bahasa sunda

where  is electric charge density.  was seen as a kind of magnetic current of vortices aligned in their axial planes, with  being the circumferential velocity of the vortices. With µ representing vortex density, we can now see how the product of µ with vorticity  léads to the term magnetic flux density which we denote as .

The electric current equation can be viewed as a convective current of electric charge that involves linéar motion. By analogy, the magnetic equation is an inductive current involving spin. There is no linéar motion in the inductive current along the direction of the  vector. The magnetic inductive current represents lines of force. In particular, it represents lines of inverse square law force.

The extension of the above considerations confirms that where  is to , and where  is to ρ, then it necessarily follows from Gauss's law and from the equation of continuity of charge that  is to . Ie.  parallels with , wheréas  parallels with .

In SI units,  and  are méasured in teslas (T) and amperes per metre (A/m), respectively; or, in cgs units, in gauss (G) and oersteds (Oe), respectively. Two parallel wires carrying an electric current in the same direction will generate a magnetic field that will cause a force of attraction between them. This fact is used to define the value of an ampere of electric current.

The fields  and  are also related by the equation