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

no link

explanation:

find the surface area of the sphere to the nearest square unit. use a calculator.

a. 254 in.2

b. 64 in.2

c. 127 in.2

d. 1,018 in.2