9. What property of an electromagnet enables it to separate steel cans from aluminum cans?
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Magnets do not stick to aluminum or copper, nor to many other electrically conductive metals. How can magnets help separate these materials from other stuff? The answer lies with Eddy Currents. If you move a magnet near a piece of conductive metal, the moving magnetic field induces currents in the metal.
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Magnetic separation is the process of separating components of mixtures by using magnets to attract magnetic materials.[1] The process that is used for magnetic separation detaches non-magnetic material with those that are magnetic. This technique is useful for not all, but few minerals such as ferromagnetic(materials strongly affected by magnetic fields) and paramagnetic (materials that are less affected but the effect is A large diversity of mechanical means are used to separate magnetic materials.[2] During magnetic separation, magnets are situated inside two separator drums which bear liquids. Due to the magnets, magnetic particles are being drifted by the movement of the drums. This can create a magnetic concentrate (e.g. an ore concentrate).[2]
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