Two weak magnetic samples P and Q are placed separately in the same non-uniform magnetic field. P moves toward the region of stronger field, while Q moves toward the weaker-field region. The induced effects disappear when the external field is removed. Which classification is consistent with these observations?
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Question

Two weak magnetic samples P and Q are placed separately in the same non-uniform magnetic field. P moves toward the region of stronger field, while Q moves toward the weaker-field region. The induced effects disappear when the external field is removed. Which classification is consistent with these observations?

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G1 Physics · Accepted Answer

A paramagnetic substance has positive susceptibility and is weakly attracted toward a region of stronger magnetic field. A diamagnetic substance has negative susceptibility and is weakly repelled toward a region of weaker magnetic field. The effects disappearing after removal of the field are also consistent with weak para/diamagnetic behaviour rather than permanent ferromagnetic magnetisation. Therefore, P is paramagnetic, Q is diamagnetic.