This is a two part demo, first part I do as a teacher demo, as students answer 3 questions, but could easily be done in groups. the second part is the introduction of electromagnetic induction, with 8 specific directions / questions.
to complete this demo you will need:
Part 1: aluminum cat food can sitting in a bowl of water so it can spin freely, string w a magnet attached to dangle and spin inside the cat food can. can will spin freely without touching.
Part 2: galvanometer with zero in the middle, coil of wire around a toilet paper roll, and a bar magnet.