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>
Summary
| 2023 Chicago Open | 08/05/2023 | Y | 8 | 20.00 | 88% | 88% | 25% |
Data
| Saint Peter Andre 3000 | BHSU | 0 | 10 | 0 | 10 |
| Curse you, Periplus the Platypus! | In Search of Things Past | 10 | 10 | 0 | 20 |
| Don't be Afraid, the Clown's Afraid Too | remembrance of lost time | 10 | 10 | 0 | 20 |
| The anti-STOON-dahl cabal (the tall Keyal et al.) | Evans Hall destruction awaiters | 10 | 10 | 10 | 30 |
| I prefer really not to speak. If I speak I’m in big trouble | I would prefer not to | 10 | 0 | 10 | 20 |
| Quasicrystal Silence | Romanos IV Diogenes’ Macaroni Grill | 10 | 10 | 0 | 20 |
| The Plague (anime)" was redirected to: "Oran High School Host Club | Team Name Think Detail | 10 | 10 | 0 | 20 |
| The Catastrophic Implosion of Packet Sub | The Canadians | 10 | 10 | 0 | 20 |