I would like to be able to measure magnetic fields that are generated by nerve i

Question

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.

Explanation / Answer

SQUIDs are sensitive enough to measure fields as low as 5 aT (5

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