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Concept

Meissner effect

The illustration depicts a central sphere surrounded by radiating lines and dots, symbolizing the Meissner effect where a superconductor expels a magnetic field.

The expulsion of a magnetic field from the interior of a material as it transitions into a superconducting state. Discovered by Walther Meissner and Robert Ochsenfeld in 1933, the effect causes a superconductor to actively cancel any external magnetic fields. This generates a repulsive force strong enough to levitate a magnet perfectly in mid-air.

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