3. Find the transfer function G(s) = E(s) / E(s) of Circuit (3c), and explain the function of this circuit. 4. Find the transfer function G(s) = E^(s)/E(s) of Circuit (4d). Then compute the magnitude and phase of G(ja), and explain frequency-domain behavior of the system. R R es (t) R E(s) E(s) eA E(s) + es(t) e(t) + C e(t) E(s) R (3c) R (4d)