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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Persistent current in a superconducting ring is possible due to zero resistance and magnetic flux quantization.
Updated On: May 7, 2026
- Resistance is exactly zero and flux is quantized
- Resistance is very high and current is quantized
- Magnetic field is zero and voltage is maximum
- Temperature is very high and resistance is finite
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The Correct Option is A
Solution and Explanation
Concept:
A superconductor is a material that shows zero electrical resistance below its critical temperature.
Step 1: In ordinary conductors, current decreases with time because electrical resistance causes energy loss as heat.
Step 2: In a superconducting ring: \[ R=0 \] So there is no energy loss due to resistance.
Step 3: Because resistance is zero, current can continue to flow for a very long time without decay. This is called persistent current.
Step 4: Also, magnetic flux in a superconducting ring is quantized, which helps maintain stable current states. Therefore, persistent current is possible because: \[ \boxed{\text{Resistance is exactly zero and flux is quantized}} \]
Step 1: In ordinary conductors, current decreases with time because electrical resistance causes energy loss as heat.
Step 2: In a superconducting ring: \[ R=0 \] So there is no energy loss due to resistance.
Step 3: Because resistance is zero, current can continue to flow for a very long time without decay. This is called persistent current.
Step 4: Also, magnetic flux in a superconducting ring is quantized, which helps maintain stable current states. Therefore, persistent current is possible because: \[ \boxed{\text{Resistance is exactly zero and flux is quantized}} \]
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