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electrical potentials

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Hi,
I´m analyzing the distribution of electrical potentials through different geometries with varying conductivities. An active electrode is firing with 1V under quasi-static conditions. To analyse the behaviour I modeled a big sphere which also contains the ground electrode and encloses the 'structure of interest'.
Now I want to manually define that the electrical potential on the big sphere should be 0, or how can I define Ve in a certain distance??

Hope someone can help!

Best, Manfred

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