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What type of mixture is formed when iron filings and sulphur are mixed ?

What is magnetic filed?

A student fixes a sheet of white paper on a drawing board. He places a bar magnet in the centre of it. He sprinkles some iron filings uniformly around the bar magnet. Then he taps the board gently and observes that the iron filings arrange themselves in particular pattern. What does the crowding of iron filings at the end of the magnet indicate?