If the input impedance is defined as zin vsis find the

Question

Problems -

Problem 1 - Find v₀ in the op amp circuit of Fig. 1.

Problem 2 - Compute i₀(t) in the op amp circuit in Fig. 2 if v_s = 4 cos(10⁴t).

Problem 3 - If the input impedance is defined as Z_in = v_s/I_s, find the input impedance of the op amp circuit in Fig. 3 when R₁ = 10 kΩ, R₂ = 20 kΩ, X₁ = 10 nF, C₁ = 20 nF and ω = 5000 rad/s.