Discussion
A follower drives a \( 220 \ \Omega \) load through its \( 1 \ \mathrm{k\Omega} \) emitter resistor at \( 2 \ \mathrm{mA} \). Its gain is about
Answer: B
The load and emitter resistor combine in parallel against the intrinsic resistance:
\[ \begin{aligned} R &= 1000 \| 220 = 180 \ \Omega \\ A_{v} &= \frac{180}{180+13} \approx 0.93 \end{aligned} \]
so about 0.93, noticeably below the unloaded 0.99 because the effective emitter resistance has fallen. Even a follower's gain drops when the load approaches its own emitter resistance, which is a useful reminder that unity is a limit rather than a guarantee.
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