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For example, let's say I have a fully charged capacitor, such that there is no current flow anywhere. Then there is an electric field between the capacitor which equals 2*sigma/epsilon_0.

But now the ciruit is opened, such that current begins flowing to discharge the capacitor. The the original E-field is decreasing (but still present), causing a B field to be generated, which also causes another E field to be generated. Is the E field then the sum of these two E-fields??