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Imagine a superconductive ring with its current being increased by EM induction.

How is current increased microscopically? I see only two possibilities:

1) Increase in the number of moving charges.
2) Increase in the speed of moving charges.

Or some combination of both.

Main question: so how is it?

Let mi ask side questions:

A) Would there be synchrotron radiation from superconducting ring (inwards acceleration of charges)?

B) Could be somebody so kind as to summarize limiting conditions for superconductivity, so far I know about temperature, magnetic field, current density... is there something else?

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