Question
The strength of radiation pressure equals the magnitude of this vector quantity over the speed of light. For 10 points each:
[10m] Name this vector quantity that represents the energy flux of an electromagnetic field. It equals the cross product of the E- and H-fields.
ANSWER: Poynting vector [prompt on S]
[10h] The Poynting vector was independently discovered by this scientist, who names a set of conditions to reduce distortion in transmission lines. He also derived the telegrapher’s equations and coined the term “impedance.”
ANSWER: Oliver Heaviside [accept Heaviside conditions]
[10e] The first telegrapher’s equation relates the spatial derivative of voltage to this quantity and its time derivative. By Ohm’s law, voltage equals this quantity times resistance.
ANSWER: current [prompt on I]
<Physics>
Summary
| 2024 ACF Winter at Lehigh | 2024-11-16 | Y | 7 | 14.29 | 100% | 43% | 0% |
| 2024 ACF Winter at Northwestern | 2024-11-16 | Y | 9 | 14.44 | 100% | 44% | 0% |
| 2024 ACF Winter at Ohio State | 2024-11-16 | Y | 9 | 14.44 | 100% | 44% | 0% |
| 2024 ACF Winter at Online | 2024-11-16 | Y | 7 | 10.00 | 86% | 14% | 0% |
| 2024 ACF Winter at Central Florida | 2024-11-16 | Y | 4 | 17.50 | 100% | 75% | 0% |
| 2024 ACF Winter at Oxford | 2024-11-16 | Y | 8 | 16.25 | 88% | 50% | 25% |
Data
| Cambridge A | Bristol A | 10 | 10 | 10 | 30 |
| Imperial A | Cambridge B | 10 | 10 | 10 | 30 |
| Cambridge C | Manchester | 10 | 0 | 10 | 20 |
| Southampton A | Cambridge D | 0 | 0 | 10 | 10 |
| Durham | Birmingham | 0 | 0 | 10 | 10 |
| Warwick A | Imperial B | 0 | 0 | 10 | 10 |
| LSE A | Oxford A | 0 | 0 | 10 | 10 |
| Oxford B | Southampton B | 10 | 0 | 0 | 10 |