Weak magnetic fields can be measured at the surface of the
Chapter 29, Problem 29.90(choose chapter or problem)
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 fieldthe strength measured for one subjectat the pole of this sphere?
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