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I hope that questions in forthcoming exams will be of higher
standard.
I think that the intention of the examiners was the following:
When there is a changing magnetic flux through a conducting loop, an
emf is induced and in this case a current as well. The current has an
associated magnetic field which must oppose the change in the
magnetic flux. If it didn't, it would contribute to the change in
magnetic flux and subsequently create a greater induced current.
This would violate the law of conservation of energy.