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then we have the extra confusing idea that whether a real coil or ideal coil, at T=0 the current is at absolute 0 because there is absolutely no resistance to yield a voltage drop, it's at a maximum across the coil. there is absolutely no current flow to yield a magnetic field, because the magnetic field that will not be created without current is opposing the current flow. hmm.a superconductive coil will yield no external field because it perfectly contains it within the conductor resisting current change, perfectly. with absolute 0 resistance we are approaching an infinite magnetic field force and thus an infinite reactance. since infinity cannot overpower infinity, they simply cancel each other out in practice. resistance is the factor that prevents a conductor from perfectly resisting an exterior magnetic field because its the factor that resists current.. with 0 resistance there is perfect opposition like a super cooled conductor opposing a magnet. in essence, can't an absolute 0 resistance in a conductor/inductor be considered both a dead short AND open circuit at the same time?

There ya go. Resistance is a necessity for current to flow. Lol Mags

I have actually always believed this and it's hard for me to think otherwise. I can't help it no matter how foolish it may seem.

So the questions i have for you MH are1-how is the current time constant calculated for your ideal inductor/

2-What is the time taken for the current to rise to peak value from T=0,that moment when the ideal voltage of 4 volts is placed across the ideal inductor?.

I have actually always believed this and it's hard for me to think otherwise. [/size]I can't help it no matter how foolish it may seem.

Like any other inductor.Indeed this question is germane to the original question, What is your answer?

You may wish to exercise a few examples to see if your conclusion is correct. Your conclusion being that if the time constant (Tau) is infinite, the load immediately presents itself as a perfect short, meaning the current will be infinite and instantaneous.Here are a few: (in all cases, L=6H)1) R=1, Tau=6s2) R=0.1, Tau=60s (1min)3) R=1m Ohm, Tau=60ks (16.6 hours)4) R=1u Ohm, Tau=6M(million)s (1667 hours)5) etc.What is happening to Tau as R decreases?If R could be 0, Tau must be infinite.What happens to the inductor current after t=0 when Tau=infinity?

T=0 is The Big Bang.Think about it. There was no time prior to that event so it had to be 0.Bill

Come on tinman, the answer's in the question. John.