Question:
In a superconducting ring, a persistent current has been flowing without decay for years. This is possible because:
In a superconducting ring, a persistent current has been flowing without decay for years. This is possible because:
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Zero Resistance = Zero Energy Loss = Infinite Flow.
Updated On: May 5, 2026
- Resistance is exactly zero and flux is quantized
- Resistance is very small but finite
- The ring is at absolute zero temperature
- Magnetic field lines are expelled
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The Correct Option is A
Solution and Explanation
Step 1: Concept
Superconductivity is a state of exactly zero electrical resistance and expulsion of magnetic fields.
Step 2: Meaning
When a current is induced in a superconducting loop, there is no ohmic heating ($I^2R$) to dissipate energy.
Step 3: Analysis
The current remains constant as long as the material stays below its critical temperature.
Step 4: Conclusion
The lack of resistance and the nature of flux quantization allow the current to persist indefinitely.
Final Answer: (A)
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