I like the magnet eating putty! I like that you were able to make the putty as well. Haven't done it before.
Here is a sim that can help them visualise the magnetic field around an electromagnet.
https://phet.colorado.edu/en/simulation/magnets-and-electromagnets
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Thank you for your link to the simulation @toni2oni. We're a low-tech class (no devices or computers) but I can share it with the kids to do at home if they want.