(a) Find an expression for the current gain \(i_{\mathrm{O}} / i_{\mathrm{S}}\) in Figure P4=5 (a).

(b) Find an expression for the current gain \(i_{\mathrm{O}} / i_{\mathrm{S}}\) in Figure \(\underline{P}_{4}=5\) (b).

(c) Simulate both circuits in Multisim. Note: Both of these circuits emulate simple transistor configurations. In (a), the circuit is called a common emitter configuration and is often used as a Follower. In (b), the transistor is connected as a common base configuration and is used to provide current gain.

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