Potential difference in a ring

Question

Basically in a circuit there is a cell with a positive and negative end, and current flows through it - electrons are pushed by negative electrode and attracted to the positive electrode. But if say a ring rotates about its diameter and say there is an applied magnetic field and as the ring rotates, there is a flux change, so according to lenz law emf will be generated, but the ring is all connected, what part is supposed to be the positive and negative end?

Answer 1

The cell's job is to create an electric field that makes the "free" electrons inside a metal move. You don't need a positive and negative end in the case you describe, because the electric field created by the changing flux makes the job of keeping the electrons circulating.