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Comments:
<0> g' nite #physics !
<1> nite
<2> hey
<3> please ask your question here
<2> alrighty.......
<2> there's 2 rings, uniformly charged
<2> on an axis
<2> a point P is on the axis
<2> both rings have a radius of R, and the rings are seperated by a distance of 3R
<2> and the distance between P and q1 is R
<2> the net electric field at point P is 0
<2> so what is the ratio of q1 to q2
<3> what course is this for
<4> Hmm, does anyone have a copy of "geometric optics on phase space"
<2> electricity and magnetism
<3> Revv, more specifically
<5> Probably a physics question in the electricity and magnetism chapter
<2> uh, not sure what you'd call it, i'm in an AP physics cl*** in high school
<6> James-S, not me. have you tried edonkey?
<3> Revv, ok that answers my question
<4> Not on there
<3> The way you can do that is
<3> Learn how to find the Electric field along the axis of a charged ring
<6> James-S, then it's your obligation to digitize it :)
<3> it is probably in the textbook
<4> Well, i dont have the physical copy
<3> once you find E(x) where x is distance along axis from center of ring...
<3> you use point P
<3> reverse engineer the charge
<6> James-S, take a wild guess if that part is part of your obligation :)
<2> uh...
<3> the electric field will be the superposition of the effects from both rings
<3> First you need to look up how to derive the electric field on the exis of a ring
<3> axis*
<2> dE = K (dq/r^2)?
<3> that's the general formula for E
<3> but you need to know how to set up the integral for a ring
<6> James-S, get a used copy, cut off the back so it's a stack of sheets and find a modern photocopier which can scan to pdf document. they are very widespread nowadays and superfast
<2> ....i wouldn't knwo how to do it, but I think it's right here...
<4> Heh
<6> several pages per second
<2> E = qz/ 4 pi epsilon naught (z^2+r^2)^3/2?
<6> then you can p*** it through abbyy finereader and manually perfect it if you want it to be a great release
<3> if you are stuck on setting up the integral you probably need some real life help
<3> as opposed to people on the internet
<2> yeah
<2> guess so, this **** is killing me
<3> it isn't '****'
<3> it's rather standard
<4> Bah
<2> microacg, i'm well aware
<4> A Pioneer in Anaclastics: Ibn Sahl on Burning Mirrors and Lenses <-- can't find that either
<2> but the word '****' can be used as a noun that describes anything
<3> you probably need someone to tutor you until you get the hang of physics integrations
<6> hehe
<2> yeah, i have no calculus background
<2> everyone else in the cl*** is in Calc
<6> James-S, u a student?
<3> you aren't in calc?
<2> i took precalc and said **** it
<2> no
<4> Nope
<3> this is ap physics c?
<4> Teacher :-P
<2> yes microacg
<2> calc based physics
<3> that is a mistake
<6> James-S, hehe at uni?
<3> they shouldn't let people take it without ap c
<4> But, i'm trying to find a book on the history of the law of the sines
<2> i didn't want to take 3 ap cl***es
<4> Both at uni/college
<2> i'm in ap english and ap physics
<2> and it's just integrals so
<4> It was something about the burning lenses with Ibn Sahl
<3> Revv: At the HS I teach AP Physics C at, they won't let you take it without pre or at least co in calc
<4> How he found the sines of the incidence and refraction in specular refraction are constant (sini/sinr)
<6> James-S, you don't have a library that might carry it?
<4> Well, we do
<4> Problem is -- the book has been lost
<6> nice
<4> Arsehole student said he lost it when on holiday
<4> That book is expensive
<6> hehe
<6> how expensive?
<4> I have about 6 optics books in my own storage
<4> Best one i've got is a Hecht one from about 22 years ago
<6> cut off their backs! :)
<4> Has it all :-)
<4> Also, i made a botched job of an image of refraction as waves
<6> feed them to the machine and set them free
<5> You can't take calculus based physics without knowing calculus. When you get into hair chapters like electricity and magnetism, it'll outright kill you.
<4> Heh, they have some as ebooks
<4> Don't laugh
<4> But they are stored via ASP
<3> djlogan_ generally speaks the truth, although with enough support you could probably blast your way through without actually taking AP Math
<4> They have a protection method that does precisely ****
<6> James-S, but that's just wrong
<6> online is ****y ****y
<5> Well, if you could fake the math, you could consider it the same as (or very similar to) algebra based physics
<4> When it comes to any browser other than internet explorer, it works JUST FINE, when you click "save" ;-)
<3> On the AP Physics Final I was grading today, they had to solve a differential equation that modelled air resistence...they woudl have been dead without 1 or 2 years of calc
<2> so microacg, there's no easy way to explain setting up the integral?
<4> http://upload.wikimedia.org/wikipedia/en/4/46/Refraction_reflection_as_wavelength.png
<7> http://tinyurl.com/244roj
<4> My extremely ***y image i botched up
<4> :-P
<3> Revv: no, no easy way :(
<3> it's easy once you understand it
<3> but that doesn't count
<6> James-S, I get broken url
<4> Made it in KOffice
<4> Yeah, refresh - cache, it'll load up
<2> maybe i'll go in early tomorrow and see if the teacher's there
<3> hopefully the teacher can help you
<3> you started EandM kinda early I think
<3> you already did the mechanics half of the year?
<2> yeah
<6> James-S, would be nice if the lines were aligned
<6> :)
<4> Haha, i know
<4> I couldnt get them to move properly
<4> The last words were "feck it, i'll just save it"
<4> After trying to resize the bottom left line, i almost bust an artery with anger
<4> :-P
<6> since it's bitmap you might try photoshop. and in layers
<4> Well, it's a PNG via gimp
<4> Also, the ray on the right is outgoing, so it's not actually refracted
<4> The incident waves line up
<6> is the target media bitmap or print?
<4> For what?
<6> the image
<4> Still though, they should line up :-/
<4> Target media is a wikipedia article
<6> so bitmap on web
<4> Guess so, i thought by bitmap you meant BMP
<6> ok no
<4> I just prefer to say image :-P
<6> but it has a tiny bit of ambiguity wouldn't you say :)
<4> Yeah, i guess so
<4> But so too do most phrases :-P
<6> but it's possible to be more specific than stuff for instance :)
<4> Yeah, i've just never used bitmap used to describe a PNG before
<6> nor did I. I meant bitmap to describe bitmap. png is the specific dataformat
<6> a bitmap dataformat
<6> pixel image...
<6> you have heard of pixels before?
<6> no?
<4> Yes
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