- #1
MattNotrick
- 7
- 0
A parallel plate capacitor is defined of two circular plates with a radius of 12cm, it is separated by a dielectric sheet with a thickness of 2 microns (um) and relative permittivity of 6. It is charged with a potential difference of 110V.
The area of one plate I found is A=pie*R^2
= 452.389cm^2
= 4.5238m^2 is the area of each plate.
I am trying to work out the Capacitance, but I am not 100% sure on which equation route to take.
c=εoεrA
------
d
right? I am not sure whether to include the εo as there is it separated by a dielectric sheet, not just air space, or where to go from here.
Are my conversions correct? 2 microns = 0.000002 meters
Also ε = εo * εr, yes / no?
I tried doing
εA
___ =
d
(1.2x10^-5)(4.5238)^2
____________________
0.000002
= 122.7885986
I feel this is wrong, or I am going down the wrong route, I've tried several different "plate capacitor calculators" on the internet, all giving me a different answer each time, confusing me even further, I think I may be using the wrong equation, any help would be much appreciated,
thanks Rick.
The area of one plate I found is A=pie*R^2
= 452.389cm^2
= 4.5238m^2 is the area of each plate.
I am trying to work out the Capacitance, but I am not 100% sure on which equation route to take.
c=εoεrA
------
d
right? I am not sure whether to include the εo as there is it separated by a dielectric sheet, not just air space, or where to go from here.
Are my conversions correct? 2 microns = 0.000002 meters
Also ε = εo * εr, yes / no?
I tried doing
εA
___ =
d
(1.2x10^-5)(4.5238)^2
____________________
0.000002
= 122.7885986
I feel this is wrong, or I am going down the wrong route, I've tried several different "plate capacitor calculators" on the internet, all giving me a different answer each time, confusing me even further, I think I may be using the wrong equation, any help would be much appreciated,
thanks Rick.