Question

Current induced in a perfect electric conductor due to a current element

Answer 1

Moving a magnet close to a conductor induces a current. If it consists of a superconducting material with resistance R=0, then my textbook says:

Then the induced current will continue to flow even after the induced emf has disappeared.

This makes sense physically - there is no resistance to stop charge flow. But then the book draws this conclusion:

Thanks to this persistent current, it turns out that the flux through the loop is exactly the same as it was before the magnet started to move, so the flux through a loop of zero resistance never changes.