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BIO Currents in the Brain. The magnetic field around the head has been measured to be approximately 3.0 × 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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