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:
Show Hint
Zero Resistance = Zero Energy Loss = Infinite Flow.
Updated On: Jun 9, 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
Show Solution
Verified By Collegedunia
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)
Was this answer helpful?
0
0
Top AP ECET Agricultural Engg Physics Questions
- If we choose velocity \(V\), length \(L\) and force \(F\) as fundamental physical quantities, then how would you express power in terms of \(V\), \(L\) and \(F\)?
- Which pair of physical quantities have same dimensional formula?
- If \(\vec A+\vec B=\vec C\) and \(A^2+B^2=C^2\), then the angle between vectors \(\vec A\) and \(\vec B\) is
- The area of rectangle with sides as \(\vec A=3\hat i+4\hat j\) and \(\vec B=\hat i+3\hat j\) is
- If a pebble is thrown vertically upwards from the top of a tower with velocity \(5\,m/s\), it strikes the ground after \(3\) seconds. With what velocity the pebble strikes the ground? \((g=10\,m/s^2)\)
View More Questions
Top AP ECET Agricultural Engg Optics Questions
Top AP ECET Agricultural Engg Questions
- Ohm's law states that
- The unit of electrical resistance is
- Kirchhoff's current law is based on the conservation of
- Kirchhoff's voltage law is based on the conservation of
- The material having nearly zero temperature coefficient of resistance is
View More Questions