>>12928066Yes, it's a good analogy. I'll need 2 posts to explain it in (mostly) full.
If you imagine a circuit it is easy to see. The stationary charges are generating an electric field. These contribute an energy The charges in motion, and only those charges, generate the magnetic field where and are capacitances and inductances respectively. Here we have ignored mutual inductances, but it's easy to generalise; just add more terms as you normally do when calculating energy due to the magnetic inductances.
So inductance is a measure of kinetic energy and capacitance is like a measure of potential energy. Of course this is really obvious because a capacitor works exactly like raising an object against a gravitational field is but you get it. Resistance is a measure of energy dissipation by collisions producing disordered motion to work against the directed flow of current. We'll come back to this.
This means that flux is a lot like momentum. Because is to momentum as is to kinetic energy.
But if you recall from Faraday's law, that the EMF is just the rate of change of magnetic flux, where you can add/remove factors of c as you please in your preferred units, then we see that or even just (the factors from choice of units aren't the point here). So the magnetic flux in the circuit is in a pretty real way, directly analogous to the momentum.
This makes sense, because the faster the charges are whizzing around, the stronger we expect the magnetic field to be. So in some sense we could even say that magnetic flux IS a kind of momentum.
(1/2)
