Magnetic rod riddle
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There are two cylindrical rods of iron, identical in size and shape. One is a permanent magnet. The other is just non-magnetised iron — attractable by magnets, but not permanently magnetic itself. Without any instrument, how can you determine which is Magnetic ? 
Touch the middle part of one rod with another.
If the rod that you hold is a magnet, it will be attracted strongly and will stick with the other rod.
If the rod that you hold is not a magnet, the attraction will be much less (depends on the sizes). This is because, the magnetic field at the centre of a magnet is weak.
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