I would like to be able to measure magnetic fields that are generated by nerve impulses in extremities like in fingers. I know that they are very weak: about 100 mV electric potential would give us about current 10 mA if resistance = 1/10 Ohm, but interested in measuring magnetic fields.
How many rounds should you have in a coil to measure 10 mA current?
The jumping of electrons from one level to another may become a problem in this case. However, I am not sure where and how.
Assume that there is a steady current in the situation so Biot-Savart law. The radius of the nerve is r = 0.003m.