to make the working of machine free of magnetism ,the cover of the machine must be of non magnetic substance, diamagnetic substance , ferromagnetic substance , paramagnetic substance
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Magnetic substance when kept in a magnetic field is feebly repelled or thrown out if the substance is diamagnetic. This happens because the substance is feebly magnetised in the direction opposite to that of the field. The susceptability of diamagnetic substance is negative. Paramagnetic substances are feebly attracted by a magnetic.
Ferromagnetic substances are strongly attracted by a magnet.
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