Question
The inability of this theory’s ideal form to explain reconnection led to the creation of Sweet-Parker and Petschek models. For 10 points each:
[10m] Name this formalism whose ideal version ignores terms proportional to diffusivity, resulting in a simpler form of Ohm's Law and the induction equation.
ANSWER: magnetohydrodynamics [or MHD; accept ideal magnetohydrodynamics or ideal MHD]
[10h] By analogy to rubber bands, the stretching, twisting, and folding of these constructs creates a dynamo. Álfven's theorem constrains the size of these surfaces by implying that a certain quantity is conserved.
ANSWER: magnetic flux tubes
[10e] Ideal MHD is a good approximation when the magnetic analogue of this quantity is large. Fluids transition from laminar to turbulent flow when this value is around a few thousand.
ANSWER: Reynolds number [accept magnetic Reynolds number]
<Science - Physics>
Summary
| 2024 ARGOS @ Brandeis | 03/22/2025 | Y | 3 | 10.00 | 67% | 33% | 0% |
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Data
| A is for Amy Robsart who fell down the stairs | Berkeley | 10 | 0 | 10 | 20 |
| Where are the ACF Nationals recordings? | Cry of the Common Loon | 0 | 0 | 10 | 10 |
| number of tang poems = 75 times number of lines in a shi = 100 times number of lines in a haiku | Stanford+ | 10 | 0 | 10 | 20 |