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willc
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Hi, does anyone know how superconductors will oppose a magnetic flux even if it is unchanging. Thanks
The Meissner effect is a phenomenon in which a superconductor expels all magnetic fields from its interior when cooled below its critical temperature. This results in the superconductor becoming a perfect diamagnet, with zero electrical resistance and perfect magnetic shielding.
The Meissner effect is caused by the formation of Cooper pairs, which are pairs of electrons that are bound together at low temperatures. These Cooper pairs create a superconducting current that flows without any resistance, and this current produces a magnetic field that exactly cancels out any external magnetic fields trying to penetrate the superconductor.
The Meissner effect has many practical applications, including in medical imaging (MRI machines), transportation (magnetic levitation trains), and energy storage (superconducting magnets for fusion reactors). It also has potential uses in quantum computing and high-speed electronics.
The critical temperature for the Meissner effect to occur varies depending on the material. However, most superconductors have critical temperatures below 10 K (-263.15 °C). Some newer superconductors, called high-temperature superconductors, have critical temperatures above 77 K (-196.15 °C).
No, the Meissner effect cannot be explained by classical physics. It is a quantum phenomenon that can only be understood using the principles of quantum mechanics. Classical physics predicts that all materials should have some resistance to electrical current, whereas superconductors exhibit zero resistance due to the Meissner effect.