Electromagnetic theory for a circular loop

A circular current loop made of flexible wire is located in a magnetic field B; you may keep B constant or vary it. Describe three ways an emf can be induced in the loop.

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...means that the direction of this induced emf is such that the current due to this emf is trying to counteract the changes in external magnetic flux.
We know that the magnetic flux  is the product of the magnetic field magnitude, B, and the projection of the loop's area, S, on the plane perpendicular to the magnetic field B:
 = B * ...