Q115 / 180 · AIIMS 2007 · Physics

Assertion :A current continues to follow in superconducting coil even after switch is off. Reason : Superconducting coils show Meissner effect.

  • A
    If both assertion and reason are true and reason is the correct explanation of assertion
  • Correct answer
    B
    If both assertion and reason are true but reason is not the correct explanation of assertion
  • C
    If assertion is true but reason is false
  • D
    If both assertion and reason are false.

Solution

The assertion is true. Even when the emf is switched off, the current continues to flow because its resistance becomes zero. The Meissner effect is another property of the superconductor and not the reason for the assertion. Meissner effect repels the magnetic field lines from the interior of the superconductor. (b)

Hence, the correct answer is option: 'B'.

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