As is well known, a change in magnetic flux through a closed loop generates an induced electromotive force, which in turn causes a current to flow through the ammeter.

This model can help you in experiments exploring the conditions for generating induced electromotive force [High School Physics]

The property that the magnetic flux remains constant when the area of a closed loop increases in a non-uniform magnetic field

I need a cylindrical strong magnet, elastic wire, and a milliampere ammeter.