$6\mathrm{.}9$ A circular$-$loop TV antenna with $\backslash (0\mathrm{.}04\backslash$mathrm$\{$~m$\}^\{2\}\backslash )$ area is in the presence of a uniform$-$amplitude $300$ MHz signal. When oriented for maximum response, the loop develops an emf with a peak value of $\backslash (30(\backslash$mathrm$\{$mV$\})\backslash ).$ What is the peak magnitude of $\backslash (\backslash$mathbf$\{$B$\}\backslash )$ of the incident wave?