Question

A magnetic field is perpendicular to the plane of a single-turn circular coil. The magnitude of the field is changing, so that an emf of 0.74 V and a current of 3.8 A are induced in the coil. The wire is then re-formed into a single-turn square coil, which is used in the same magnetic field (again perpendicular to the plane of the coil and with a magnitude changing at the same rate). What emf and current are induced in the square coil?

Answer 1

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Answer 2

Changing the loop from a circle to a square will multiply its area by a factor pi/4.
The induced voltage will be multiplied by that factor.
Since the wire resistance will remain unchanged, the induced current will also be multiplied by a pi/4 factor.