We could use a magnet.
Iron is made up of a lot of litle magnetic sensitive molecules that tends to react to the presence of a magnetic field. A piece of iron will “feel” the magnetic field and orientate itself according to it. [iron fillings around a magnet]
Sawdust is an organic molecule that like a bundle of cooked spaghetti doesn’t react a lot to the magnetic field or at least not so dramatically.
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