The small currents in axons corresponding to nerve impulses produce measurable magnetic fields. a typical axon carries a peak current of 0.040 μa. what is the strength of the field at a distance of 1.2 mm

Explanation:

The magnetic field produced by a current-carrying wire is given by

where

is the vacuum permeability

I is the current

r is the distance from the wire

In this problem we have

r = 1.2 mm = 0.0012 m

So the magnetic field strength is

if the person is shown to have +90n, then ans is -10n.

if the person is shown to have -90n, then ans is +10n.