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A ferrite is a ferrimagnetic ceramic used at high frequency because it has

  • A.a Curie temperature above that of iron
  • B.a high resistivity, which suppresses eddy currents
  • C.a higher permeability than any ferromagnetic metal
  • D.no hysteresis loss whatever at any frequency

Answer: B

Being an oxide it conducts very poorly, so the eddy currents that ruin an iron core at radio frequency scarcely flow. Its permeability and saturation flux density are both well below iron's, which is the price paid for that freedom.

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