The op-amp in the circuit in Figure P12.66 has an open-loop differential voltage gain of \(A_{d}=10^{4}\). Neglect the current into the op-amp, and assume the output resistance looking back into the op-amp is zero. Determine:

(a) the closed-loop voltage gain \(A_{v}=V_{o} / V_{s}\),

(b) the input resistance \(R_{i f}\), and

(c) the output resistance \(R_{o f}\).

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+1 Rif www Rs = 5kQ + Figure P12.66 Rof -oVo R = 50 R = 4kQ www RF = 10 kQ R = 10 kQ