Science Buddies: "Ask an Expert"

how many electromagnets are needed to test the strength of one electromagnet?
Im trying to do an experiment where i find the strength (distance of attraction and how much it can attract) of an electromagnet and i need to know how many i would need.

one what?

Hi Noah,
Welcome to the Ask an Expert forums. You've chosen a very interesting topic with electromagnetism. Howeve,r I don't quite understand your question. Can you tell us more about what you are trying to do?
Thanks,
Chris