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- Effects of Ag2O doping on the electromagnetic properties in the BiSrCaCuOsuperconductors. The electromagnetic properties of the Ag2superconductor were evaluated to investigate the contribution of the pinning centers to the magnetic effect. It was confirmed experimentally that a large amount of magnetic flux was trapped in the Ag2O doped sample than that in the undoped one, indicating that the pinning centers of magnetic flux are related closely to the occurrence of the magnetic effect. It is considered that the area where normal conduction takes place increases by adding Ag2O and the magnetic flux penetrating through the sample increase the pinning centers of the magnetic flux, contributing to the occurrence of the electromagnetic properties.