Packet 3: Bonus 4
The auxiliary magnetic field H is defined in terms of the B-field, the magnetization, and this physical constant. For 10 points each:
[10m] The enclosed current in Ampère’s law is multiplied by what constant that is the magnetic analogue of the vacuum permittivity? You may either name the quantity or give the symbol used to write it.
ANSWER: mu-nought [or permeability of free space; or vacuum permeability; or vacuum magnetic permeability; or mu-zero or mu-sub-zero; prompt on mu]
[10h] Mu-nought exactly equals this value times ten to the negative seven Newtons per ampere squared. Coulomb’s constant equals the reciprocal of the product of this value and epsilon-nought.
ANSWER: four pi [or four times pi; or two times tau; prompt on decimal expansions such as 12.566…]
[10e] The electromagnetic wave equation shows that this quantity equals one over the square root of the product of mu-nought and epsilon-nought. Einstein theorized that energy equals mass times this quantity squared.
ANSWER: speed of light [or velocity of light; prompt on c; prompt on speed or velocity]
<Editors, Physics> | Packet C
| Editions | Heard | PPB | Easy % | Medium % | Hard % |
|---|---|---|---|---|---|
| 2 | 109 | 17.43 | 99% | 45% | 30% |
Conversion
| Team | Opponent | Part 1 | Part 2 | Part 3 | Total | Parts |
|---|---|---|---|---|---|---|
| Cambridge A | Birmingham | 0 | 10 | 10 | 20 | HE |
| Cambridge B | Bristol | 10 | 10 | 10 | 30 | MHE |
| Cambridge C | Southampton | 0 | 0 | 10 | 10 | E |
| Cambridge D | Warwick | 10 | 0 | 10 | 20 | ME |
| Cambridge E | Imperial B | 10 | 10 | 10 | 30 | MHE |
| Imperial C | Cardiff | 0 | 0 | 10 | 10 | E |
| Imperial D | Oxford | 10 | 0 | 10 | 20 | ME |
| LSE | Imperial A | 0 | 0 | 10 | 10 | E |
Summary
| Tournament | Edition | Exact Match? | Heard | PPB | Easy % | Medium % | Hard % |
|---|---|---|---|---|---|---|---|
| UK (North) | UK | Y | 5 | 20.00 | 100% | 60% | 40% |
| UK (South) | UK | Y | 8 | 18.75 | 100% | 50% | 38% |
| Northern California | US | Y | 4 | 27.50 | 100% | 75% | 100% |
| Eastern Canada (1) | US | Y | 4 | 15.00 | 100% | 50% | 0% |
| Eastern Canada (2) | US | Y | 8 | 13.75 | 100% | 25% | 13% |
| Florida | US | Y | 4 | 12.50 | 100% | 25% | 0% |
| Great Lakes | US | Y | 10 | 17.00 | 100% | 40% | 30% |
| Lower Mid-Atlantic | US | Y | 9 | 14.44 | 100% | 44% | 0% |
| Upper Mid-Atlantic | US | Y | 9 | 15.56 | 100% | 22% | 33% |
| Midwest | US | Y | 10 | 18.00 | 90% | 40% | 50% |
| North | US | Y | 4 | 22.50 | 100% | 75% | 50% |
| Northeast | US | Y | 11 | 18.18 | 100% | 55% | 27% |
| South Central | US | Y | 6 | 13.33 | 100% | 33% | 0% |
| Southeast | US | Y | 12 | 19.17 | 100% | 58% | 33% |
| Upstate NY | US | Y | 5 | 20.00 | 100% | 40% | 60% |