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Define different types of magnetic materials and give one example in each case. |
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Answer» Solution :On the basis of their behaviour in a magnetic field, the VARIOUS materials can be classified in three classes. (i) Diamagnetic substances. Those materials, which when placed in a magnetic field, are feebly magnetised in a direction opposite to the MAGNETISING field are called diamagnetic substances. A few examples of diamagnetic materials are : copper, zinc, bismuth, water, sodium chloride, helium, argon etc. When a diamagnetic substance is suspended in a magnetic field, it ARRANGES itself in the direction of the magnetic field. (ii) Paramagnetic substances. Those materials, which when placed in a magnetic field, are feebly magnetised in the direction of the magnetic field, are called paramagnetic substances. A few examples of paramagnetic substances are : aluminium, sodium, antimony, PLATINUM, copper chloride, liquid oxygen etc. When a paramagnetic substance is suspended in a magnetic field it arranges itself to the direction of magnetic field. (iii) Ferromagnetic substances. Those materials, which when placed in a magnetic field are strongly magnetised in the direction of the magnetising field, are ferromagnetic substances. A few examples of ferromagnetic substances are : iron, NICKEL, cobalt, alnico, mercury etc. |
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