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The Magnet

by Kevin J. Lin

On a table are two iron rods- one blue, one red. Other than their color, the only difference between them is that one is a magnet. Their weight, size, and feel are identical. Also on the table are:

  • A glass of water
  • A 5 1/4" floppy disk
  • A spool of thread

Assuming you only have the above mentioned items to work with, what is the easiest method to determine which rod is the magnet?

See the Solution
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