THE MAGNETIC FLUX LINES ARE EXCLUDED FROM THE MATERIAL
Transition temp. is the temp. at which a normal conductor changes to super conductor. Transition temp. is very low eg. for mercury it is 4.6 kelvin.at trans.temp. the conductor conducts current with zero resistance.magnetic flux lines are so not present because there is no resistance.if u r in india pls refer to 12th tamilnadu physics boob lesson no.2.