Discussion
How does a source resistor left unbypassed affect the gain?
Answer: D
An unbypassed source resistor divides the gain by one plus the transconductance times that resistance, exactly as an emitter resistor does in a bipolar stage. It is very much in the signal path, cannot raise the transconductance, and does not turn the stage into a current source. Because the transconductance is small, the same resistor produces far less degeneration here than it would in a bipolar stage, which is worth allowing for. Working one numerical case through both cases side by side fixes the distinction better than any rule of thumb.
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