(Solved): 1. The magnetic field around the human head has been measured to be approximately 3108 gauss ( ...

1. The magnetic field around the human head has been measured to be approximately $3\times 10^{?8}$ gauss ( 1 gauss $=10^{?4}\mathrm{T}$ ). If we model the head as a circular loop of current (a very poor assumption!) of diameter $16\mathrm{cm}$, what is the current required to produce such a magnetic field at its center?