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Superconducting magnetic energy storage holds energy in

  • A.the electric field between superconducting plates
  • B.the rotation of a superconducting bearing
  • C.a phase change within the superconductor
  • D.the magnetic field of a superconducting coil

Answer: D

Current circulates in the coil with no resistive loss for as long as the temperature is maintained, and the energy is released almost instantaneously. The cryogenic plant makes it expensive and its standby load significant.

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