This paper is studied on magnetic shielding
of the hollow cylindrical YBCO superconductor including the
perfect diamagnetic property, that is, the internal magnetic
flux is zero (B=0). It's found that there is magnetic flux against
at surface of the hollow cylindrical superconductor being close
circuit. So this circuit exists zero resistance, there by magnetic
flux density disappears within superconducting material cause
of persistent current flowing around the external surface. That
is, the persistent current compensates with the external magnetic
flux within hollow cylindrical superconductor.
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