- #1
marmeduke
- 2
- 0
hi, I've just been reading a bit of physics to get myself ready to do a degree after a year of not a lot and was looking at uniform fields so i tried to prove that infinite plates have a uniform field however i seem to have disproved it with coulombs law. here's my logic, please explain the fault.
looking at the a particle in the field separation of d from the plates (in the middle) the field due to each plate is 2kq/(d^2), now looking at it where the distance is say d/2,3d/2 now we get the field as 4kq/d^2+4kq/9d^2 which is obiviously much larger. the only thing which i can see i may have done wrong is treat the plates as point charges however i can't see how this is a problem because if you take the plates to be infinite then you integrate to find the force from the plates which is acting then it is a scalar multiple of the original force. i hope someone understands this and thank you for taking the time to read this :)
looking at the a particle in the field separation of d from the plates (in the middle) the field due to each plate is 2kq/(d^2), now looking at it where the distance is say d/2,3d/2 now we get the field as 4kq/d^2+4kq/9d^2 which is obiviously much larger. the only thing which i can see i may have done wrong is treat the plates as point charges however i can't see how this is a problem because if you take the plates to be infinite then you integrate to find the force from the plates which is acting then it is a scalar multiple of the original force. i hope someone understands this and thank you for taking the time to read this :)