Draw the magnetic field lines distinguishing between diamagnetic an...

Question

Draw the magnetic field lines distinguishing between diamagnetic and paramagnetic materials. Give a simple explanation to account for the difference in their magnetic behaviour.

Accepted Answer

Diamagnetic material (placed in external field):

Field lines are expelled/pushed out from the material.
Material develops magnetisation opposite to $\vec{B}$.
Reason: Atoms have no permanent moments; external field induces moments opposite to itself (analogous to Lenz's law). $\chi_m 0$ (small).

Key difference: Diamagnetics have no permanent atomic moments; paramagnetics do.

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