You have been given three beakers with a magnet in each. Pour iron filings in each one of them and then pour very coldwater in one,very hot water in the second and keep the third one empty.Which magnet will attract maximum amount of iron fillings? justify your answer
The strength of a magnet decreases on heating. So, the magnet in the hot water will be the weakest. The magnet kept in cold water will be slightly stronger than the magnet kept without water. So, the cold magnet will attract the maximum amount of the fillings,