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The kind of magic without which all of this wouldn't be possible. This tag should be used for questions about the **physics** of the fields that charged particles create and how these fields interact. It should not be used for all questions involving electromagnetism; that would be everything on the site.
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How is electromagnetic interference possible when measuring voltage difference?
This question is primarily concerned with audio but it's probably applicable to other areas as well.
As far as I understand, EMI is caused by electromagnetic waves adding power to wires as they trans …