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Magnetism and Matter
Question
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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?        

                                                   

Answer

A paramagnetic material tends to move from weaker to stronger regions of the magnetic field and hence increases the number of lines of magnetic field passing through it. Relative permeability is greater than 1. So, magnetic lines of force pass through the substance. 

A diamagnetic material tends to move from stronger to weaker regions of the magnetic field and hence, decreases the number of lines of magnetic field passing through it. Relative permeability is 1 and magnetic lines of force do not pass through the substance.

Distinguishing feature is because of the difference in their relative permeability. 

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