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Potential function trough rectangular

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Hi guys, I'm beginner in COMSOL software and I'm trying to model an exercise of electromagnetics in COMSOL. The exercise is in the book "Elements of Electromagnetics - Sadiku - 3rd edition, specifically the sketch at page 218. But the problem is: I can't put the potential in each boundary. And I don't know what means "zero charge". Does it have relation with my problem?

Thanks.

0 Replies Last Post 21 lug 2017, 17:55 GMT-4
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Hello Rafael Simplicio

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