Why outlets spark when unplugging - EMF & Inductors

I like your channel, and this video too. But while I like your expose about induction, I think your into about the spark (actually, it is an arc, not a spark, when you break a circuit) in the switch is a bit of a red herring. The induction story doesn't describe why you always get an arc. Of course you can argue that no circuit really has L=0 mH. But even without that argument you get an arc: when you break the circuit there is a potential difference over the gap. At first that gap is extremely small so that a discharge can happen very easily. That creates a conductive channel (plasma) that will be visible as an arc. And because it is already conducting, it will keep going. So you don't need the masses of energy, or momentum, to be able to "jump the gap". How violent the arc is will of course depend on how much energy is stored in the circuit, either in inductors or elsewhere.