UmbralRaptor changed the topic of #kspacademia to: https://gist.github.com/pdn4kd/164b9b85435d87afbec0c3a7e69d3e6d | Dogs are cats. Spiders are cat interferometers. | Космизм сегодня! | Document well, for tomorrow you may get mauled by a ネコバス. | <UmbralRaptor> egg|nomz|egg: generally if your eyes are dewing over, that's not the weather. | <ferram4> I shall beat my problems to death with an engineer. | We can haz pdf
<mofh> egg: egg|cell|egg: finally back
* egg chews mofh
* egg chews the netsplits too
* egg vomits mofh on the carpet and jumps onto the sink
<mofh> so what happened is I decided that given that I no longer *had* to run this laptop over a random leboncoin charger connected over bodge wire given I had a proper DC-DC cable, to replace it. fib insisted on also cleaning the laptop, and then we discovered a cascading failure *had* happened, but not on the laptop: the wires on the power brick started arcing this time. So we had to find a spare of those.
<mofh> UmbralRaptor: pong
<mofh> UmbralRaptor: ping*
<mofh> I am otherwise free
<egg> UmbralRaptor: ask mofh electromagnics questions
<egg> using electromagnetics
<UmbralRaptor> eleggtromagnetics
<galois> title: Caroline on Twitter: "… "
<galois> title: #kspacademia on 2020-01-09 — irc logs at whitequark.org
<UmbralRaptor> mofh_: so, http://complex.gmu.edu/phd/exam/EM-Aug-2019.pdf question 4
<UmbralRaptor> particularly part 2
<mofh> UmbralRaptor: Bleh. Like, I'm not sure I'll be of that much help on E&M specifically; still taking a look right now tho.
<mofh> (I at least found my copy of Jackson, so there's that...)
<UmbralRaptor> Incidentally, some of these problems are literally Jackson problems
<UmbralRaptor> (this one isn't I think)
<mofh> I mean I sadly am not surprised.
* egg places mofh above an infinitely large grounded conducting plane
<egg> (I have questions about the idea of a non-grounded infinitely large contucting plane)
<UmbralRaptor> I mean, are those infinite charge sheets we give to Physics II students grounded?
<UmbralRaptor> (Though they might not be conductors)
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<UmbralRaptop> bleah
<mofh> UmbralRaptop: so far I honestly am not sure how to even solve this
<mofh> (like, E&M *was* the qual that took me >1 attempt)
<UmbralRaptop> I'm not liking the look of this derivative https://photos.app.goo.gl/YcSH9iRpd8Q78vvx8
<galois> title: Shared album - Patrick N - Google Photos
<UmbralRaptop> mofh: only qual I got on the first attempt was classical >_<
<UmbralRaptop> !8 Am I good enough to have impostor syndrome?
<galois> UmbralRaptop: no
* UmbralRaptop 🔪 galois
<mofh> UmbralRaptop: E&M took me 3 tries
<mofh> classical I barely made, apparently
<UmbralRaptop> hrm
<egg> what boundary conditions does the problem statement imply for E?
* egg has forgotten everything about eleggtromagnetism, not that he ever knew more than whatever was in first year physics...
<UmbralRaptop> We don't care about E below the plane because the mirror charge isn't real
<UmbralRaptop> So boundary would typically be z ≥ 0
<egg> oh right the mirror charge thing is a thing
<egg> how the fuck did I forget so much stuff
<egg> how the fuck was it so long ago, too
<UmbralRaptop> hahahah *sob*
<egg> apparently last time I had physics lectures (as opposed to mathematical methods of physics) was physics III in late 2012
<UmbralRaptop> literally my first semester at UMKC o_O
<egg> (my first semester at ETHZ was autumn 2011)
<egg> UmbralRaptop: so the mirror charge thingy tells us that this is like having two antiparallel dipoles 2d apart?
<UmbralRaptop> yes
<egg> hm
<egg> UmbralRaptop: I wonder if things would look nicer if you did it in polar coordinates around the centre?
<UmbralRaptop> So it's *just* taking the right derivatives and products
<egg> UmbralRaptop: yeah, but as you point out that potential looks tedious to derive
<egg> unless there's an obvious simplification...
<UmbralRaptop> Part of the problem is dipoles being dipoles, I have that cos(θ) that is centered on each
<egg> yeah
<egg> but precisely, geometry might help
<egg> the only thing there is to life etc.
<egg> then again perhaps that's not useful here
<egg> UmbralRaptop: wait, I have a question about what you wrote
<egg> that θ
<egg> it lies in the xz plane?
<UmbralRaptop> yes
<egg> but there's nothing xzish about the field of the individual dipole
<egg> there's something xish
<egg> but not xzish
<egg> that V for an individual dipole is not symmetric in rotation around x
<egg> that's no dipole
<UmbralRaptop> bleh, need more y then
<egg> UmbralRaptop: but wait; draw those cos θ on the diagram
<egg> or r cos θ rather
<egg> r cos θ = x, for both 1 and 2, right?
<egg> thus cos θ = x/r
<UmbralRaptop> yeah
<egg> x/(r-dipole position) rather
<egg> and we have an r squared term at the denominator, so that becomes an r cubed term but other than that we're good
<egg> the denominators in z are thus going to be (x^2+y^2+(z-d)^2)^(3/2) and (x^2+y^2+(z+d)^2)^(3/2) I think?
<UmbralRaptop> yep
<egg> (not sure if that's an improvement in terms of niceness to derive)
<UmbralRaptop> technically yes
<egg> UmbralRaptop: you could try working in cylindrical coordinates around the z axis to make it a bit more palatable
<egg> denominators become (r^2 + (z±d)^2)^(3/2), you get a trig function in the denomoinator and of course you need to dig up/rederive the gradient in cylindrial coordinates, but it might be marginally nicer; probably a matter of taste at that point
<egg> s/denomoinator/numerators/
<galois> egg meant to say: denominators become (r^2 + (z±d)^2)^(3/2), you get a trig function in the numerators and of course you need to dig up/rederive the gradient in cylindrial coordinates, but it might be marginally nicer; probably a matter of taste at that point
<egg> UmbralRaptop: does that sort things out?
<egg> (a brief attempt at plotting the gradient of that with mathematica yields a field that's not obviously wrong so there's that)
<galois> title: Shared album - Patrick N - Google Photos
* UmbralRaptop pokes the E field with a kitten
<egg> hmm
<egg> where did the terms with a 3/2 in the denominator go in the derivative
<egg> did 5=3 at some point
<UmbralRaptop> oops
<UmbralRaptop> note to self: 5≠3
<egg> UmbralRaptop: well
<egg> UmbralRaptop: in characteristic other than 2, it is
<egg> UmbralRaptop: I guess that's a reminder to try to write not necessarily well, but with distinguishable glyphs
<egg> if 5 looks like 3, it will be equal to 3 somewhere down the page
<UmbralRaptop> glyphs are distinguishable, though >_<
<egg> yeah
<egg> UmbralRaptop: it's ballpoint?
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<UmbralRaptop> yes, why?
<UmbralRaptop> !wpn e_14159_
* galois gives e_14159_ a blue Debye herpolhode
<egg> I absolutely hate writing with ballpoint pens, so looking at things written with that make me feel like it must have been uncomfortable to write; but I guess your mileage may vary
<egg> (do use something with which writing is comfortable, whatever that is for you, because, well, algebraic manipulations tend to involve a lot of it)
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* egg pokes mofh with the dipoles
<egg> !wpn
* galois gives egg a 猫
* egg stabs mofh with a 猫
<egg> simplified kitty
<UmbralRaptop> !choose traditional kitty | simplified kitty
<galois> UmbralRaptop: Your options: traditional kitty , simplified kitty . My choice: traditional kitty
<e_14159_> !wpn UmbralRaptop
* galois gives UmbralRaptop a cathodic frustrating gonad
<UmbralRaptop> uhm
<e_14159_> Yes, the choice is quite interesting
<e_14159_> (The only reason I'm currently awake is because coughing is keeping me so. I'll be off to bed again soon, perchance to sleep)
<egg> speaking of sleep I should do that
<UmbralRaptop> !choose sleep | don't sleep
<galois> UmbralRaptop: Your options: sleep , don't sleep . My choice: sleep
<egg> UmbralRaptop: does the rest of the eleggtromagnetic question sort itself out from there?
<mofh> egg: ?
<UmbralRaptop> well, how to write the p vector (p \hat x?)
* egg pokes with UmbralRaptop
* egg pokes mofh with UmbralRaptop
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* egg|laptop|egg zzz
<egg|laptop|egg> mofh: please take over the deconfusing of the raptor
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* UmbralRaptop hurt themself in their confusion!
<mofh> egg: so I'm still confused at all of these E&M questions
<mofh> been trying to refresh my memory but I think I might be of more use on, well, any other qual :/
<UmbralRaptop> blarg
<UmbralRaptop> uh, I can grab some QM questions later
<mofh> I'l be around, reading thru my copy of Griffiths atm
* egg|cell|egg meows at whitequark
<egg|cell|egg> UmbralRaptor what do you mean by the vector p and why do you want to write it
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<galois> [WIKIPEDIA] Soviet space dogs#Bobik and ZIB | "During the 1950s and 1960s the Soviet space program used dogs for sub-orbital and orbital space flights to determine whether human spaceflight was feasible. In this period, the Soviet Union launched missions with passenger slots for at least 57 dogs. The number of dogs in space is smaller, as some dogs..."
<egg|laptop|egg> apparently this is the only space cat https://en.wikipedia.org/wiki/F%C3%A9licette
<galois> [WIKIPEDIA] Félicette | "Félicette (French pronunciation: ​[fe.liː.sɛt]) was the first cat launched into space, on 18 October 1963 as part of the French space program. Félicette was one of 14 female cats trained for spaceflight. The cats had electrodes implanted onto their skulls so their neurological activity could be monitored..."
<egg|laptop|egg> > The other nine cats were decommissioned at the end of the program
<egg|laptop|egg> !u ℛ
<galois> ℛ: U+211b SCRIPT CAPITAL R
<egg|laptop|egg> !wpn
* galois gives egg|laptop|egg a logarithmic quark
<egg|laptop|egg> !wpn UmbralRaptop
* galois gives UmbralRaptop an optimized sexy citation
<egg|laptop|egg> um
<egg|laptop|egg> !wpn whitequark
* galois gives whitequark a keter euclid hyperboloid
<whitequark> keter euclid
<egg|laptop|egg> scary hyperboloid
* egg|laptop|egg places mofh on an infinite grounded plane
<_whitenotifier-d13c> [Principia] eggrobin opened pull request #2438: Symmetric bilinear forms on bivectors and the anticommutator form - https://git.io/Jvf6p
<_whitenotifier-d13c> [Principia] Pending. Build queued… - 
<_whitenotifier-d13c> [Principia] Pending. Building… - http://casanova.westeurope.cloudapp.azure.com:8080/job/Principia/4082/
<egg|laptop|egg> meow
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<_whitenotifier-d13c> [Principia] Failure. Build finished. - http://casanova.westeurope.cloudapp.azure.com:8080/job/Principia/4082/
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<egg|laptop|egg> whitequark: this tweet reminds me of that blade dril tweet https://twitter.com/tef_ebooks/status/1216363862095810565
<galois> title: tef ebooks on Twitter: "what i really want is to build a product out of tiny undocumented compilers written by an undergrad, powerful enough to write any code as long as it doesn't use infix notation"
<egg|laptop|egg> O_o why does googling [blade dril] give me a result whose title starts with wint на Твитеру
<egg|laptop|egg> (it's the right tweet, but why the ru title, when I'm using google in fr)
<egg|laptop|egg> something something the three human languages I guess
<egg|laptop|egg> винт
<whitequark> "на Твитеру" isn't russian
<whitequark> sounds like ua or be perhaps
<whitequark> serbian?
<whitequark> yeah, all hits i get are serbian
<egg|laptop|egg> lol
<egg|laptop|egg> most powerful compiler in the world, howeve,r it is so fragile as to ICE when handled by any force other than the delicate touch of reverse polish notation .
<egg|laptop|egg> whitequark: how would you say that in ru?
<egg|laptop|egg> (на Твитеру, not the dril tweet)
<egg|laptop|egg> ah, ?lang=ru works
<egg|laptop|egg> в Твиттере apparently
<egg|laptop|egg> whitequark: by the way FYI, ua isn't an ISO 639 code, I think you meant uk
<egg|laptop|egg> (more confusing situations exist, e.g. SV *is* an ISO 3166 code, for a place that doesn't really speak sv, and la *is* an ISO 639, but not for a language of LA)
<_whitenotifier-d13c> [Compatibility] Success. #347 succeeded - https://dev.azure.com/mockingbirdnest/445d7b9d-0318-42e3-857f-b69d40b1ed1b/_build/results?buildId=347
<egg|laptop|egg> git commit -am "~Long Long Line~"
<_whitenotifier-d13c> [Principia] eggrobin synchronize pull request #2438: Symmetric bilinear forms on bivectors and the anticommutator form - https://git.io/Jvf6p
<_whitenotifier-d13c> [Principia] Pending. Build queued… - 
<_whitenotifier-d13c> [Principia] Pending. Building… - http://casanova.westeurope.cloudapp.azure.com:8080/job/Principia/4083/
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<_whitenotifier-d13c> [Principia] Success. Build finished. - http://casanova.westeurope.cloudapp.azure.com:8080/job/Principia/4083/
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<_whitenotifier-d13c> [Principia] pleroy opened pull request #2439: Add the word "template" in a few places - https://git.io/JvfXd
<_whitenotifier-d13c> [Principia] pleroy closed pull request #2439: Add the word "template" in a few places - https://git.io/JvfXd
<_whitenotifier-d13c> [Principia] pleroy pushed 2 commits to master [+0/-0/±2] https://git.io/JvfXF
<_whitenotifier-d13c> [Principia] pleroy 85063f5 - Add the word "template".
<_whitenotifier-d13c> [Principia] pleroy 2c57f19 - Merge pull request #2439 from pleroy/Clang Add the word "template" in a few places
<_whitenotifier-d13c> [Principia] pleroy labeled pull request #2439: Add the word "template" in a few places - https://git.io/JvfXd
<_whitenotifier-d13c> [Principia] eggrobin unlabeled pull request #2439: Add the word "template" in a few places - https://git.io/JvfXd
<_whitenotifier-d13c> [Principia] eggrobin labeled pull request #2439: Add the word "template" in a few places - https://git.io/JvfXd
<_whitenotifier-d13c> [Principia] pleroy opened pull request #2440: Add the word "template" in a few places - https://git.io/Jvf1n
<_whitenotifier-d13c> [Principia] pleroy labeled pull request #2440: Add the word "template" in a few places - https://git.io/Jvf1n
<_whitenotifier-d13c> [Principia] pleroy pushed 3 commits to master [+0/-0/±6] https://git.io/Jvf1c
<_whitenotifier-d13c> [Principia] pleroy 475f6ae - Add the word "template".
<_whitenotifier-d13c> [Principia] pleroy 3a5d598 - Merge remote-tracking branch 'mockingbirdnest/master' into Clang
<_whitenotifier-d13c> [Principia] pleroy ffd6e80 - Merge pull request #2440 from pleroy/Clang Add the word "template" in a few places
<_whitenotifier-d13c> [Principia] pleroy closed pull request #2440: Add the word "template" in a few places - https://git.io/Jvf1n
<mofh> ...that's a lot of PRs/commits, holy shit.
<egg|laptop|egg> mofh: not that much, it's mostly the same commit being built again and again as phl debugged the pipelines :-p
<egg|laptop|egg> mofh: also the outcome of those discussions with mlbaker https://github.com/mockingbirdnest/Principia/pull/2438
<galois> title: Symmetric bilinear forms on bivectors and the anticommutator form by eggrobin · Pull Request #2438 · mockingbirdnest/Principia · GitHub
<galois> title: Principia/symmetric_bilinear_form_test.cpp at 81c95cc9c9850eb74ad505a8c5faac3cffe4ebff · mockingbirdnest/Principia · GitHub
<egg|laptop|egg> wait why am I expecting the same thing on two consecutive lines
<_whitenotifier-d13c> [Principia] eggrobin unlabeled pull request #2440: Add the word "template" in a few places - https://git.io/Jvf1n
<_whitenotifier-d13c> [Principia] eggrobin labeled pull request #2440: Add the word "template" in a few places - https://git.io/Jvf1n
<_whitenotifier-d13c> [Principia] eggrobin synchronize pull request #2438: Symmetric bilinear forms on bivectors and the anticommutator form - https://git.io/Jvf6p
<_whitenotifier-d13c> [Principia] Pending. Build queued… - 
<_whitenotifier-d13c> [Principia] Pending. Building… - http://casanova.westeurope.cloudapp.azure.com:8080/job/Principia/4084/
<mofh> ahh yes, the bivectors
<_whitenotifier-d13c> [Principia] Success. Build finished. - http://casanova.westeurope.cloudapp.azure.com:8080/job/Principia/4084/
<_whitenotifier-d13c> [Principia] pleroy opened pull request #2441: Fix an error with enum class - https://git.io/JvfDZ
<_whitenotifier-d13c> [Principia] Pending. Build queued… - 
<_whitenotifier-d13c> [Principia] Pending. Building… - http://casanova.westeurope.cloudapp.azure.com:8080/job/Principia/4085/
<_whitenotifier-d13c> [Principia] pleroy labeled pull request #2441: Fix an error with enum class - https://git.io/JvfDZ
<_whitenotifier-d13c> [Principia] pleroy closed pull request #2441: Fix an error with enum class - https://git.io/JvfDZ
<_whitenotifier-d13c> [Principia] pleroy pushed 3 commits to master [+0/-0/±2] https://git.io/JvfDn
<_whitenotifier-d13c> [Principia] pleroy 902d3fa - Error with enum class.
<_whitenotifier-d13c> [Principia] pleroy 52025f8 - Merge remote-tracking branch 'mockingbirdnest/master' into Clang
<_whitenotifier-d13c> [Principia] pleroy 8f60c3b - Merge pull request #2441 from pleroy/Clang Fix an error with enum class
<_whitenotifier-d13c> [Principia] Success. Build finished. - http://casanova.westeurope.cloudapp.azure.com:8080/job/Principia/4085/
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<UmbralRaptop> mofh, egg: sorry, I was paralyzed and hallucinating for most of the past 12 hours
<_whitenotifier-d13c> [Principia] pleroy opened pull request #2442: Add "template" in even more places - https://git.io/JvfyI
<_whitenotifier-d13c> [Principia] pleroy pushed 3 commits to master [+0/-0/±2] https://git.io/JvfyL
<_whitenotifier-d13c> [Principia] pleroy 6f92b7d - Add "template" in even more places.
<_whitenotifier-d13c> [Principia] pleroy 303f01f - Merge remote-tracking branch 'mockingbirdnest/master' into Clang
<_whitenotifier-d13c> [Principia] pleroy 6bb45b8 - Merge pull request #2442 from pleroy/Clang Add "template" in even more places
<_whitenotifier-d13c> [Principia] pleroy closed pull request #2442: Add "template" in even more places - https://git.io/JvfyI
<_whitenotifier-d13c> [Principia] pleroy labeled pull request #2442: Add "template" in even more places - https://git.io/JvfyI
<_whitenotifier-d13c> [Principia] scimas opened issue #2443: Vessels "forget" prediction settings upon landing - https://git.io/Jvfy4
<mofh> UmbralRaptop: np, tho I am afraid I will be of essentially no help E&Mwise :/
* egg|laptop|egg bonks mofh on the head with a grounded plane
<egg|laptop|egg> !wpn -add:adj grounded
<galois> Added adj 'grounded'
<egg|laptop|egg> !wpn -add:wpn plane
<galois> Added wpn 'plane'
<egg|laptop|egg> !wpn -add:wpn sphere
<galois> Entry already exists!
<egg|laptop|egg> !wpn -add:wpn ball
<galois> Added wpn 'ball'
<egg|laptop|egg> !wpn -add:wpn dipole
<galois> Entry already exists!
<egg|laptop|egg> !wpn -add:wpn charge
<galois> Added wpn 'charge'
<egg|laptop|egg> !wpn -add:adj charged
<galois> Added adj 'charged'
<egg|laptop|egg> !wpn -add:adj magnetic
<galois> Added adj 'magnetic'
<egg|laptop|egg> !wpn -add:adj paramagnetic
<galois> Added adj 'paramagnetic'
<egg|laptop|egg> !wpn -add:adj ferromagnetic
<galois> Added adj 'ferromagnetic'
<egg|laptop|egg> !wpn -add:adj diamagnetic
<galois> Added adj 'diamagnetic'
<egg|laptop|egg> !wpn -add:adj parabolic
<galois> Entry already exists!
<egg|laptop|egg> !wpn -add:adj diabolic
<galois> Added adj 'diabolic'
<_whitenotifier-d13c> [Principia] pleroy commented on issue #2443: Vessels "forget" prediction settings upon landing - https://git.io/JvfS4
<egg|laptop|egg> !wpn -add:adj transsonic
<galois> Added adj 'transsonic'
<egg|laptop|egg> !wpn -add:adj subsonic
<galois> Added adj 'subsonic'
<egg|laptop|egg> !wpn -add:adj supersonic
<galois> Added adj 'supersonic'
<_whitenotifier-d13c> [Principia] pleroy opened pull request #2444: The templates keep coming - https://git.io/JvfSE
<_whitenotifier-d13c> [Principia] pleroy closed pull request #2444: The templates keep coming - https://git.io/JvfSE
<egg|laptop|egg> !wpn -add:adj hypersonic
<galois> Added adj 'hypersonic'
<_whitenotifier-d13c> [Principia] pleroy pushed 3 commits to master [+0/-0/±2] https://git.io/JvfSz
<_whitenotifier-d13c> [Principia] pleroy 9a508d0 - They keep coming.
<_whitenotifier-d13c> [Principia] pleroy 24d0764 - Merge remote-tracking branch 'mockingbirdnest/master' into Clang
<_whitenotifier-d13c> [Principia] pleroy 36848e1 - Merge pull request #2444 from pleroy/Clang The templates keep coming
<_whitenotifier-d13c> [Principia] pleroy labeled pull request #2444: The templates keep coming - https://git.io/JvfSE
<_whitenotifier-d13c> [Principia] eggrobin unlabeled pull request #2441: Fix an error with enum class - https://git.io/JvfDZ
<_whitenotifier-d13c> [Principia] eggrobin labeled pull request #2441: Fix an error with enum class - https://git.io/JvfDZ
<_whitenotifier-d13c> [Principia] eggrobin labeled pull request #2442: Add "template" in even more places - https://git.io/JvfyI
<_whitenotifier-d13c> [Principia] eggrobin unlabeled pull request #2442: Add "template" in even more places - https://git.io/JvfyI
<_whitenotifier-d13c> [Principia] eggrobin labeled pull request #2444: The templates keep coming - https://git.io/JvfSE
<_whitenotifier-d13c> [Principia] eggrobin unlabeled pull request #2444: The templates keep coming - https://git.io/JvfSE
<SilverFox> !wpn -add:adj Sonic
<galois> Added adj 'Sonic'
<UmbralRaptop> !wpn -add:wpn hedgehog
<galois> Added wpn 'hedgehog'
UmbralRaptop is now known as NomalRaptor
<NomalRaptor> !choose doomed|quaked
<galois> NomalRaptor: Your options: doomed, quaked. My choice: quaked
* egg|laptop|egg places NomalRaptor above a grounded plane
<egg|laptop|egg> NomalRaptor: did you manage to do the rest of that question?
<NomalRaptor> no
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<egg|laptop|egg> NomalRaptor: the force is the force between the real dipole and the ghostly one, right?
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* egg|laptop|egg pokes NomalRaptor in the dipoles
* egg|laptop|egg stabs mofh with NomalRaptor and NomalRaptor with a dipole
<NomalRaptor> yeah. Or between the dipole and the ghostly (?) E field
<egg|laptop|egg> NomalRaptor: well the E field we have, it's as real as it gets
<egg|laptop|egg> NomalRaptor: what formulae do you know that pertain to dipoles?
<egg|laptop|egg> (I have never interacted with dipoles in what little eleggtromagnetism I had in the physics classes I had, but I suppose you have some things, otherwise the exams wouldn't talk about dipoles)
<NomalRaptor> qual and class content varies enough between years that eggceptions happen
<egg|laptop|egg> NomalRaptor: yeah ok but what do you know about dipoles
<egg|laptop|egg> are there forces? or just torques
<NomalRaptor> Yes, but usually (eg: several Griffith's problems), we only care about torques
<mofh> egg|cell|egg: ?
* egg|cell|egg electrifies mofh
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<galois> title: truckfreak: "@setup@myasstodon.xyz sometimes i think of descri…" - Todon.nl
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<NomalRaptor> !8 eigenvalue problems?
<galois> NomalRaptor: no
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<SilverFox> that's illegal im calling the police
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<galois> [WIKIPEDIA] Method of image charges#Electric dipole moments | "The method of image charges (also known as the method of images and method of mirror charges) is a basic problem-solving tool in electrostatics. The name originates from the replacement of certain elements in the original layout with imaginary charges, which replicates the boundary conditions of the..."
<NomalRaptor> why are method of images and method of image charges separate pages?
<NomalRaptor> also O_O
<egg|laptop|egg> NomalRaptor: https://fr.wikipedia.org/wiki/Dip%C3%B4le_%C3%A9lectrostatique#Dip%C3%B4le_passif
<galois> [WIKIPEDIA] Dipôle électrostatique#Dipôle passif | "Un dipôle électrostatique se définit par une répartition de charges électriques de somme nulle telles que le barycentre des charges positives ne coïncide pas avec celui des charges négatives. Le dipôle le plus simple est donc un couple de deux charges de signe opposé distantes d'une longueur a non nulle…"
<egg|laptop|egg> NomalRaptor: try computing the gradient of inner product (p, E) where the dipole is, and seeing whether you get that F
<NomalRaptor> je ne dire pas français >_>;;
<egg|laptop|egg> NomalRaptor: you need not to say french
<egg|laptop|egg> NomalRaptor: merely read the eggspression for F
<egg|laptop|egg> or what I wrote in the preceding message, which is the same)