If the area of the coil remains same, then emf and current remain same. I am uncertain of the question here,I am thinking it is trying you to take a length of wire l, and make a circle with it, then a square, and compare the areas.
I wonder if that is the 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 0.93 V and a current of 2.7 A are induced in the coil. The wire is the 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?
2 answers
Yes, that's the question, but I'm confused as to how I should find the length.