x-no-archive: yes
Calculus is beyond both of us.... Complete the circuit or the ignition coil... current starts to flow and a magnetic field builds.... as the lines of magnetic foce expand across the cunductor coil, back emf is induced and we experience reactance. Is it intended? No.... Does it happen? Yes..... Is this an AC circuit? No, polarity has not changed, it is indeed a DC circuit - a pulsating DC circuit, but a DC circuit none-the-less. And the only formulae you can come up with are cut and paste from electronic web sites....
Reactance can be associated with a moving magnetic field..... it is impedance without resistance. You need to be able to think in terms of cause and effect.
The modern automobile has many instances of frequency without polarity change.... but then you knw that and merely forgot for a few moments, right?
Surprisingly, blissful ignorance shouldn't be thought of as brilliance. You constantly assert that I have something to prove to you and you avoid, time and again, ever offering up any proof that you have the foggiest idea what it is you are talking about. I suggest that you might lead a more fullfilling life if you were the least bit helpful.
And that's Mr. Warman to you, cretin.