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Question
Show diagrammatically the behaviour of magnetic field lines in the presence of (i) paramagnetic and (ii) diamagnetic substances. How does one explain this distinguishing feature?
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Solution
(i) The behaviour of magnetic field lines in the presence of a diamagnetic substance is shown below:
(ii) The behaviour of magnetic field lines in the presence of a paramagnetic substance is shown below:
This distinguishing feature is because of the difference in their relative permeabilities. The relative permeability of the diamagnetic substance is less than 1; so, the magnetic lines of force do not prefer passing through the substance. The relative permeability of a paramagnetic substance is greater than 1; so, the magnetic lines of force prefer passing through the substance.
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