Question

This statement caused J. J. Thomson to formulate positive charges as distributed throughout matter in his plum pudding model. For 10 points each:
[10m] Name this statement that prohibits the existence of a fixed arrangement of magnets in stable equilibrium. It can be proven from Maxwell’s equations via the result that magnetic fields in free space do not achieve maxima.
ANSWER: Earnshaw’s theorem
[10e] This technology uses electromagnets with alternating polarity to circumvent the consequences of Earnshaw’s theorem, allowing trains to float above their tracks.
ANSWER: maglev [or magnetic levitation]
[10h] To lower energy costs, the Inductrack system for maglev uses permanent magnets in this configuration. Magnets in this configuration form a line and cycle among four orthogonal orientations in order to achieve nearly one-sided flux.
ANSWER: Halbach arrays
<David Bass, Physics>

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Summary

2023 Chicago Open08/05/2023Y820.0088%88%25%

Data

Quasicrystal SilenceRomanos IV Diogenes’ Macaroni Grill1010020
The Plague (anime)" was redirected to: "Oran High School Host ClubTeam Name Think Detail1010020
The Catastrophic Implosion of Packet SubThe Canadians1010020
Saint Peter Andre 3000BHSU010010
Curse you, Periplus the Platypus!In Search of Things Past1010020
Don't be Afraid, the Clown's Afraid Tooremembrance of lost time1010020
The anti-STOON-dahl cabal (the tall Keyal et al.)Evans Hall destruction awaiters10101030
I prefer really not to speak. If I speak I’m in big troubleI would prefer not to1001020