you have found three metal bars all painted white. one bar is a magnet, one is made from copper and one is a pice of iron. using nothing else how can you fing out which is which
The copper bar will be attracted to neither the ends nor the middle of either the iron bar or the magnet. The iron bar will be attracted to the ends of the magnet, but not to the middle The end of the magnet will be attracted to the full length of the iron bar. Here's how you do it. Pick up a bar. Touch its end to the ends of each of the other bars. If nothing happens, then the bar in your hand is copper. If it attracts one, then touch the end of your bar to the middle of the one it attracted. If it still attracts, then you're holding the magnet, and the other one is iron. If not, then the reverse.
The copper will stick to neither. The iron will stick to 1 (the magnet) The magnet will stick to 1 (the iron) So you can eliminate the copper. hmmmmmneed to think. Using nothing else. Still thinking.
The copper one will be attracted to the magnet, wherease the iron one will not be.
