(a)\(E_e=\frac{\Phi}{A}=\frac{(220W)(0.05)}{4 \pi (10m)^2}=8.75*10^{-3}W/m^2\)

\(E_0=\sqrt{\frac{2E_e}{\epsilon_0 c}}=2.57V/m\)

(b)\(E_e=\frac{\Phi}{A}=\frac{2000W}{(10^{-6}cm^2)( \frac{0.01m}{cm})^2}=2*10^{13}W/m^2\)

\(E_0=\sqrt{\frac{2E_e}{\epsilon_0 c}}=1.23*10^8 V/m\)

\(B_0=\frac{E_0}{c}=\frac{1.23*10^8 V/m}{3*10^8 m/s}=0.409T\)