Recent content by galipop

  1. G

    Solving Plate Capacitor Problem with Voltage U

    Hi All, I've been doing a few problems with plate capactors and I have this new one which introduces a voltage U. I haven't seen an example with a voltage befopre so I'm not sure where to start it. I'm hoping someone could start me off. The problem goes like this: Find the electric field...
  2. G

    Vector Potential Between Parallel Wires: Calculating & Differences

    does anyone want to have a crack at it?
  3. G

    Vector Potential Between Parallel Wires: Calculating & Differences

    Hi All, I've just looked at an example for calculating the vector potential for a point in the vicinity of a long straight wire. I've now got to calculate the vector potential for a point between 2 parallel straight wires carrying currents in opposite directions. How does the vector...
  4. G

    Capacitance of a plate capacitor increases

    How can I show that the capacitance of a plate capacitor increases if a dielectric material fills the space between the plates?
  5. G

    Solving Constants a & b for Electric Field E - Curl & Divergence

    Thanks guys... Arunma, how did you know the solution without being able to derive it correctly?
  6. G

    Solving Constants a & b for Electric Field E - Curl & Divergence

    ok so I redid the curl and got 2xc(1-b) = 0 therefore b=1 to satisfy that the curl = 0 and a=-1 so that the div = 0 :) ok that was easy after all... now how do I compute the potential?
  7. G

    Solving Constants a & b for Electric Field E - Curl & Divergence

    Hi All, Given electric field E=c(2bxy,x^2+ay^2), I need to determine the constants a and b such that CURL E = 0 and DIV E = 0. I'm also given a path from (0,0) , (1,0) and (1,1). Ok so the curl = 0+0+cx(2-b) = 0 and the divergence = 2cy(b+a) = 0 How do I solve for a and b at this...
  8. G

    Plot the lines of the electric field between a small point charge

    Thanks for the reply! Can you expand a bit more on starting with an electric field due to an infinite charged plate?
  9. G

    Plot the lines of the electric field between a small point charge

    I've been asked to complete electric field E and potential V inside and outside of a simple plate capacitor (the plates are infinitely large and the distance between the two plates is d.) My working is as follows. Inside the cap- E = \frac{ \sigma } { \epsilon_{o} } then potential V=Ed...
  10. G

    Line integral over a triangle

    ah...i was integrating from 0->1 and 0->1...that's why I wasn't getting the expected answer. So now I've done both parts, the results are the same. This is due to the relationship between Gauss and Stokes theroems correct? Now for part 3... Determine the constants a and b such that...
  11. G

    Line integral over a triangle

    Curl of E is: c<0,0,2x-2bx> normal to the area is <0,0,1> how do I integrate this over the area of the triangle? Thanks...
  12. G

    Line integral over a triangle

    oh. I thought HallsOfIvy was still talking about the 1st part :)
  13. G

    Line integral over a triangle

    Why do you need to take the curl of E and integrate it over the area?
  14. G

    Line integral over a triangle

    Hi again... I found an example on the net somewhere showing a similar example for a circle. After looking and that and these notes I think I sort of understand now. Ok so evaluating the integrals: (0,0) -> (0,1) = 0 (0,1) -> (1,1) = c ( 1 + (a/3) ) (1,1) -> (0,0) = c * sqrt(2)^3 / 3 (...
Back
Top