- #1
center o bass
- 560
- 2
As I have understood it, it is a classical problem to show that the force between to capacitorplates is [tex] \frac{1}{2}\epsilon _0 E^2 A[/tex], which is at first counterintuitive since one should think that it is [tex]QE = \epsilon_0 E^2 A[/tex]. I am pondering that question a bit now and i saw the MIT lecture http://ocw.mit.edu/courses/physics/8-02-electricity-and-magnetism-spring-2002/video-lectures/embed07/ where it is explained, but I don't quite get the explanation. When is it ever assumed that the conductor has any with? That is.. is it not only a plane in which it does not have a volume and therefore it is absurd to talk about the electric field inside the conductor?
And why would we ever have to average the two anayway? The efield inside doesn't apply any force. The only force on the plate is from the efield outside and that is certainly E.
Can anyone explain this to me?
And why would we ever have to average the two anayway? The efield inside doesn't apply any force. The only force on the plate is from the efield outside and that is certainly E.
Can anyone explain this to me?