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Potential distribution in the Insulation boundaries.

Posted 18 mai 2017, 02:37 UTC−4 1 Reply

NDN UNIST/Mechanical Engineering
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Hi all
I'm working with Electrostatic Module, but when I get the 1D - Line plot for Electrical Potential distribution a long x-axis ( x=from 0 to 80 um, y=0 ), the plot likes " potential.pgn" image.

I just think that in the boundaries set by Zero Charge ( that means " Insulation boundaries ), the potential is totally "Zero", but in my case, this figure is not Zero, it seem to be slight decrease.

Does anyone help to to clear my problem ? Thanks in advanced


1 Reply Last Post 18 mai 2017, 11:07 UTC−4
Robert Koslover Certified Consultant
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Posted: 8 years ago 18 mai 2017, 11:07 UTC−4
A "zero charge" boundary condition simply does not force the potential to be zero. For example, consider a point charge in empty space. There is no charge anywhere except the point. But the potential falls off radially (as 1/r) away from the charge; there are spherical constant-potential surfaces around the charge. As another simple example, consider an idealized parallel plate capacitor: the potential varies linearly along any perpendicular line between the two plates. This corresponds to a constant E field from one plate to the other. You may wish to read/review an introduction to electrostatics. Many are available on the internet.
A "zero charge" boundary condition simply does not force the potential to be zero. For example, consider a point charge in empty space. There is no charge anywhere except the point. But the potential falls off radially (as 1/r) away from the charge; there are spherical constant-potential surfaces around the charge. As another simple example, consider an idealized parallel plate capacitor: the potential varies linearly along any perpendicular line between the two plates. This corresponds to a constant E field from one plate to the other. You may wish to read/review an introduction to electrostatics. Many are available on the internet.

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