Discussion
If a material is repelled in an external magnetic field then it is
Answer: B
The material is diamagnetic.
A diamagnetic material has a small negative susceptibility: the applied field induces a magnetisation opposing it, so the material is pushed towards weaker field, that is, repelled.
Paramagnetic and ferromagnetic materials have positive susceptibility and are attracted, ferromagnets strongly. Antiferromagnetic materials have a small positive susceptibility as well, so they are weakly attracted, not repelled.
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