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A diamagnetic material has a susceptibility that is

  • A.small and negative
  • B.small and positive
  • C.large and positive, of order a thousand
  • D.zero at all temperatures

Answer: A

The applied field induces moments that oppose it, so the material is very slightly repelled from a field and its relative permeability is a shade below one. Copper, water and bismuth are examples, with susceptibilities of order minus ten to the minus five.

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