Making a magnet by electromagnetic induction.

Making a magnet by electromagnetic induction. A large current (about 10 amps) is sent through a large coil fitted with an iron core, producing a strong magnetic field. A non-magnetized steel rod is placed touching the iron core. The iron molecules in the rod line up with the magnetic field from the coil and core, thus producing a temporary magnet capable of picking up and holding loose iron filings, nails, etc. The Timer box reminds the demonstration operator to turn off the apparatus in 20 seconds to avoid damaging the coil.