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How is persistent current produced in supermagnets?

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in Engineering Physics II by (679k points)
How is persistent current produced in supermagnets?

(a) By passing ac current

(b) By magnetising it

(c) By passing dc current

(d) By increasing the resistance

This question was posed to me in an interview for job.

The query is from Hall Effect in chapter Semiconductors of Engineering Physics II

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The correct choice is (c) By passing dc current

To explain: When dc current of large magnitude is once induced in a super conducting ring then the current persists in the ring even after the removal of the field. This current is called persistent current. This is due to diamagnetic property. The magnetic flux inside the ring will be trapped in it and hence current persists.

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