The following diagram illustrates the behavior of diamagnetic and paramagnetic materials in a magnetic field.
In a diamagnetic material, the net magnetic moments of atoms are zero. Thus, when they are placed in an external magnetic field, they acquire a magnetic moment in a direction opposite the external field, and thus are repelled.
In a paramagnetic material, there is a preferred direction of the magnetic moments of atoms. When external field is applied, these moments are aligned along the direction of the field.
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