Excellent explanation of how to reduce magnetic EMFs.
This great educational video explains how “net current” and the resulting magnetic (electromagnetic) fields from wiring issues in buildings are created. The practice of combining or joining neutrals from multiple circuits is discouraged and how it violates national electric code. This video explains what to look for and how to correct it.
https://ehtrust.org/tracing-magnetic-fields-emf-by-karl-riley/