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why the metal plate of a capacitor is defined to be made of air instead of being a kind of metal in "capacitance model 12689"
Posted 20.09.2012, 09:21 GMT-4 Low-Frequency Electromagnetics, Materials 4 Replies
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Hi all,
I was looking at the "computing capacitance" model 12689, and I figued out that the metal plate material is defined to be made of air.
Why we do not define the metal plate material as a kind of metal, and leave it to be built by air?!
The link to access the model is:
www.comsol.com/showroom/documentation/model/12689/
I was looking at the "computing capacitance" model 12689, and I figued out that the metal plate material is defined to be made of air.
Why we do not define the metal plate material as a kind of metal, and leave it to be built by air?!
The link to access the model is:
www.comsol.com/showroom/documentation/model/12689/
4 Replies Last Post 20.09.2012, 10:03 GMT-4
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Posted:
1 decade ago
Sarah,
in this electrostatic model the material doesn't really matter. The two plates are set to terminals at 0 and 1V and this and the geomertty are the only things that affect the field in the static case. Things get different in a non-stationary case and with currents. Then the conductivity must be assigned to the domains.
Cheers
Edgar
in this electrostatic model the material doesn't really matter. The two plates are set to terminals at 0 and 1V and this and the geomertty are the only things that affect the field in the static case. Things get different in a non-stationary case and with currents. Then the conductivity must be assigned to the domains.
Cheers
Edgar
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Posted:
1 decade ago
Thanks Edgar,
if I want to consider the plate material as a parameter which affects the field, which model should I use?
if I want to consider the plate material as a parameter which affects the field, which model should I use?
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Posted:
1 decade ago
That depends on your model. If it is about low frequency AC you would probably choose emf, if high frequencies are involved you must switch to RF.
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Posted:
1 decade ago
thanks alot for your help