Question: Weak magnetic fields can be measured at the surface of the brain. Although the currents causing these fields are quite complicated, we can estimate their

Weak magnetic fields can be measured at the surface of the brain.
Although the currents causing these fields are quite complicated, we can estimate their size by modeling them as a current loop around the equator of a 16-cm-diameter (the width of a typical head) sphere.
What current is needed to produce a 3.0 pT field—the strength measured for one subject—at the pole of this sphere?

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