Assertion : A current continues to flow in superconducting coil even after switch is off.
Reason : Superconducting coils show Meissner effect
AIIMS 2007, Easy
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Current continues to flow in a super conducting coil even after switch off because at critical temperature, its resistance is zero so there is no hinderance to current flow.
Meissner effect says that at critical temperature magnetic field inside the conductor is zero i.e, $B = 0$ but this does not explain assertion.
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