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1. Find current with correct explanation

Transcribed Image Text:Currents in the Brain. The magnetic field around the head has been measured to be
approximately 3.0 x 10-8 G. Although the currents that cause this field are quite
complicated, we can get a rough estimate of their size by modeling them as a single
circular current loop 16 cm (the width of a typical head) in diameter. What is the current needed to
produce such a field at the center of the loop?
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