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A superconductor placed in a weak magnetic field

  • A.reverses the direction of the field within itself
  • B.excludes the field entirely from its interior
  • C.concentrates the field within itself as iron does
  • D.leaves the field unchanged

Answer: B

Surface currents flow without resistance and produce a field that exactly cancels the applied one inside, so the material behaves as a perfect diamagnet with a susceptibility of minus one. This Meissner effect is what allows a magnet to be levitated stably above a cooled superconductor.

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