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3. current electricity — Physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 SciencePhysics3. current electricity1 Mark
MCQ
Assertion : A current continues to flow in superconducting coil even after switch is off.

Reason : Superconducting coils show Meissner effect

  • A
    If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
  • ✓
    If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
  • C
    If the Assertion is correct but Reason is incorrect.
  • D
    If both the Assertion and Reason are incorrect.
✓

Answer

Correct option: B.
If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
b
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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