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hutchphd

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alan123hk said:In the example below, we can write the instant result 0.2V without solving complex voltage loop equations.

If all you have in your toolbox is a hammer, everything begins to look like a nail.

One can likely contrive situations where this approach has hueristic appeal. In general, for reasons well stated, it is a "solution" in search of a problem. For your symmetry argument to hold, the entire magnetic universe would need to be cylindrically symmetric. Might be tough.

Stokes theorem deals with closed curves for a reason