The transistor in the ac equivalent circuit shown in Figure P6.60 has parameters \(\beta=80\) and \(V_{A}=\infty\). Determine

(a) the voltage gain \(A_{v}=V_{o} / V_{i}\),

(b) the current gain \(A_{i}=I_{o} / I_{i}\), and

(c) the input resistance \(R_{i}\).

(d) If \(V_{A}=80 \mathrm{~V}\), find (i) the output resistance \(R_{o c}\) and (ii) the output resistance \(R_{o}\).

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40= 2 mA Figure P6.60 R RC= 1.5 HH www RL= 2.5