(a)

\(q=4\pi r^2\sigma=4\pi(\frac{1.2m}{2})^2(8.1*10^{-6}C/m^2)=3.66*10^{-5}C\)

(b)

\(\Phi=\frac{q}{\epsilon_0}=\frac{3.66*10^{-5}C}{8.85*10^{-12}C^2/N*m^2}=4.1*10^6 N*m^2/C\)