Substance's attraction to external magnetic field i.e., their magnetic property/behavior distinguishes paramagnetic substance from diamagnetic substance.
A diamagnetic substance is one whose atoms have no permanent magnetic dipole moment. They are slightly repelled by a magnetic field and do not retain the magnetic properties when the external field is removed
The examples of diamagnetic materials are copper, gold, antimony, silver, lead and hydrogen.
Paramagnetic materials are those materials that are weakly attracted by the external magnetic field. They are slightly attracted by a magnetic field and do not retain the magnetic properties when the external field is removed.
Examples of paramagnetic materials are aluminium, sodium and calcium.
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