My 8 yr old daughter is doing a project for the science fair that is "Can you find traces of iron in food, dollar bills, and other household items with a magnet?"

I was wondering how strong of a magnet she needs for this project and a good place to buy the magnets would be?

Thanks!

My 8 yr old daughter is doing a project for the science fair that is "Can you find traces of iron in food, dollar bills, and other household items with a magnet?"

I was wondering how strong of a magnet she needs for this project and a good place to buy the magnets would be?

Thanks!
Try Radio Shack, if you get the rare earth magnet becareful, I got cut because two of them slam together too quick (they came from old hard drive)