Comments by "" (@jmitterii2) on "Sabine Hossenfelder" channel.

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  5. My favorite example to explain undefined and singularity similar to the result you get with Relativity concerning black hole density becoming mass/volume become m/0... that it's tantamount to Ohm's Law. Mathematically undefined divide by 0 is meaningless as saying go north of the north pole. So in physical theories that give you results that are undefined you have to realize the relationship of that theory no longer apply, you are beyond the limits of the relationship that theory is capable of describing and predicting. Ohm's Law states Current = voltage/Resistance. So if you had 0 ohm's of resistance you would get a singularity of current or infinite current per the law. That's not what happens. Superconductors literally have 0 ohm's of resistance, but the current doesn't approach infinite amps. It is true that the current can exist within these circuits indefinitely, but the amperes is not infinite as adding additional voltage to superconductive circuit to increase amps is limited to the temperature that increases in doing so, at a certain amps the temperature in the circuit will induce a resistance ending the superconductivity and limiting the amount of amps that circuit can contain. Instead one must look to other properties when 0 resistance is achieved. In this case, the Meissner effect is the phenomena that takes place in such 0 resistant (superconductive) conditions. Which are mathematically described in the London equations. Which explain the expulsion of the magnetic field about the superconductive current which explains the limit of voltage and current that can be applied to such a circuit until the temperature exceeds superconductive temperatures and a resistance the circuit returns.
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