english: Well, first there are strands of magnetic field left inside, but now the superconductor doesn't like them moving around, because their movements dissipate energy, which breaks the superconductivity state.
non_english: Kot prvo, nekaj silnic magnetnega polja je ostalo znotraj, vendar superprevodnik ne mara, da bi se pomikale naokoli, saj njihovi premiki razsipajo energijo, to pa prekine stanje superprevodnosti.