Question:
The phenomenon where a superconductor expels an external magnetic field is known as:
The phenomenon where a superconductor expels an external magnetic field is known as:
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Superconductors don’t let magnetic fields in — they push them out! That’s the Meissner effect, a signature of true superconductivity.
Updated On: May 28, 2025
- BCS effect
- Meissner effect
- Josephson effect
- Hall effect
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The Correct Option is B
Solution and Explanation
Superconductors are special materials that exhibit zero electrical resistance below a certain critical temperature. One of the key defining phenomena of superconductivity is the Meissner effect.
What is the Meissner Effect?
What is the Meissner Effect?
- When a material transitions into the superconducting state, it not only loses all electrical resistance but also actively expels magnetic fields from its interior.
- This means the magnetic field lines are pushed out, making the magnetic flux inside the superconductor exactly zero — a property that distinguishes superconductors from perfect conductors.
- This effect leads to magnetic levitation and is used in applications like maglev trains.
- (A) BCS Effect: Refers to Bardeen-Cooper-Schrieffer theory, which explains the microscopic mechanism of superconductivity, not magnetic field expulsion.
- (C) Josephson Effect: Describes tunneling of superconducting electron pairs through an insulating barrier — not related to magnetic field behavior.
- (D) Hall Effect: Occurs in semiconductors and conductors where a magnetic field causes charge carriers to deflect — unrelated to superconductivity.
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