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4. Alternative losses (ac losses)
While a superconductor has no losses in a constant electromagnetic environment, losses, known as alternating or ac losses, appear as soon as the induction or current varies over time. The Maxwell-Faraday law states that a time-varying magnetic induction automatically generates an electric field. The induction is either external or linked to the transport current (self-field). The electric field and the critical current density (critical state) then create density losses
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Alternative losses (ac losses)
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