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Questions about finding the spatial charges in 2D model in electrostatic

Posted Mar 9, 2017, 5:13 p.m. EST Version 5.2a 0 Replies

Shuo Ma
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Hi, my question involves how to find the spatial charge distribution in 2-D model. My model involves two spheres where in 2-D are just two circles. One sphere with surface charge 1C and the other has charge 0 C. And both spheres' domain is set to be terminal. By putting the 0 C sphere above the 1 C sphere, I want to measure how much charges are on the 0 C sphere. But the strange thing is that the induced charges on the boundary on 0 C sphere do not add up to 0 C but close to 0 C. I check the polarization distribution and find the polarization on the upper and lower hemispheres are different which means that the induced surface charges on these two sides of circle cannot be same. If the charge is conserved, there must be charges somewhere inside the domain of 0 C sphere. But I do not know how to find the charges that are missing. Can you help me with this?

Thanks.
0 Replies Last Post Mar 9, 2017, 5:13 p.m. EST
COMSOL Moderator

Hello Shuo Ma

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