Recent content by juvan

Ok... I think I get what you are all saying and thank you for the replies. All the answers combined really helped, the only slightly confusing answer was 'Qwertywertys'. This helped to support what 'Philip Wood' and 'nasu' said. What I got from it is that the electric field in a capacitor is...

Hello everyone, I have drawn a picture of my confusion, I think it says it all: Now to add some text: so we charge two capacitors C1 and C2 to a voltage V. Now we have two charged capacitors. We now connect -Q1 to +Q2 and nothing else (the other two legs are floating). From my basic...

Actually it is much simpler, I kind of complicated things a bit with the V0 part (it is actually V0=0). It's actually like you said at the beginning, and there is no need to iterate anything. Although the result I get is the same either way. Yes of course the ball is repelled from the one disk...

Yes for the sake of calculation you assume it to be constant. And then you go on to calculate the sigmas on the disks (because the ones on the ball just changed), and then you do it again for the charges on the ball, and so on you iterate it (since it converges to a value). To be frank, I...

Hi again, this time I think I've got it. So to end this thread properly I'll just quickly tell what I did. I think that I basically did what you said, it's just that I didn't exactly understand it from the equations and things you said. This is the main equation I was starting from...

Not really. Could you just write out the equations, that should probably tell me more than words.

Back again. Ok this time I'll take an overall view of the problem to try to explain as best as I can where I get stuck. Let's word the problem again. Bare with me x) There are two identical charged disks distance d apart. Calculate the force exerted on a conductive ball, when it is put between...

Ok, this is exactly how I calculate all the \sigma(r_i) when I know all the potentials, BUT I cannot see how you meant to calculate the potential of the ball once it is no longer touching the plane, with this equation. You were leaning on the fact that we now know Q_{ball}, but how do we use...

You mean, that I should use the previous equation I wrote and saying that i=1,2,...,N+M (N all the surfaces of the plates, and M all the surfaces of the ball)? You mean that I should use the previous equation I wrote BUT now, say that i=1,2,..N (not counting the ball) If my upper two...

Hmm.. Ok. Firstly I'll just tell you how I calculated σ only from the potentials at the cond. surf. If you look at the equation I wrote for V(T), I will rewrite it now for the way I did it numerically. V_j = V0 = \frac{1}{4\pi\epsilon_0}\sum_{i=1}^{N} \frac{\sigma_i' dS_i'}{R_{ij}} ...

Well there isn't really any text to the task, just the task itself, which is to calculate what would happen to a charged ball in between two conducting disks at some potential. That's it. So i, from what I know (the potential), said let the ball be touching one of the disks so I know all of the...

Thank you Jano, for your reply. Now let me further elaborate what I did. I started all the work from the solution of Poisson's equation for the electric potential V(T)=\frac{1}{4\pi\epsilon_0}\int\limits_A \frac{\sigma(T')da'}{R} then I went on to copy some of the "magic" from the book, to set...

Hi, how to calculate the force on a charged conductive body (ball), when that body is between two parallel plates (+V, -V) (see image), ooh and I am calculating numerically. I would first calculate the surface charges on the conductive surfaces (2 disks + ball), then calculate the potential...