AIIMS 2007
- Exam
- AIIMS
- Year
- 2007
- Subject
- Physics
- Chapter
- Current Electricity
AIIMS 2007 · Physics · Current Electricity
Assertion :A current continues to follow in superconducting coil...
Assertion :A current continues to follow in superconducting coil even after switch is off.
Reason : Superconducting coils show Meissner effect.
Options
- AIf both assertion and reason are true and reason is the correct explanation of assertion
- BIf both assertion and reason are true but reason is not the correct explanation of assertion
- CIf assertion is true but reason is false
- DIf both assertion and reason are false.
Correct answer
B. If both assertion and reason are true but reason is not the correct explanation of assertion
Step-by-step 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)