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A comment on The First Room-Temperature Ambient-Pressure Superconductor. Parent comment

Re:The First Room-Temperature Ambient-Pressure Superconductor by floxy on Tuesday July 25, 2023 @06:55PM (#36870857)
Right. Everyone should just read up on Earnshaw's theorem to know what all the boundary conditions are.

https://en.wikipedia.org/wiki/Levitron

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Re:The First Room-Temperature Ambient-Pressure Superconductor by jacquesm on Tuesday July 25, 2023 @07:02PM (#36870933)
I wonder how long you could get one of those to spin in a vacuum.

Halbach arrays with compensating coils have been proposed for some interesting applications, such as low loss flywheels for electrical storage. I don't know if that ever got commercialized but I do recall that some prototypes were made by a US company. I can't find a reference to it though.

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Re:The First Room-Temperature Ambient-Pressure Superconductor by floxy on Tuesday July 25, 2023 @07:22PM (#36871105)
>I wonder how long you could get one of those to spin in a vacuum.

Not too much longer apparently...

https://www.youtube.com/watch?v=mn7IedCgva0

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