If I move my hand through 90 degrees in the Earth's magnetic field it goes from having full flux linkage to no flux linkage. Suppose I make that movement in 0.1s. An emf will be induced. Your job is to look up the strength of the Earth's magnetic field and make other estimates to first calculate the induced emf. Then you need to think back to last year's work on resistivity, make some more estimates and work out the resistance of the ring. Finally you need to calculate the current that flows in the ring when I move my hand like that. Should I be worried?
