As usual, wikipedia makes a good starting point for study - https://en.wikipedia.org/wiki/Bioelectromagnetics
Incidentally, Sergey N. Makarov at Worcester Polytechnic Institute researches "human body interaction with EM fields" and has written a book Brain and Human Body Modeling available for free here - https://link.springer.com/book/10.1007/978-3-030-21293-3 You might find some of the chapters relevant.