Discussion
How is a field effect transistor used as a voltage-controlled resistor?
Answer: C
Keeping the drain voltage small holds the device in the ohmic region, where the channel is a resistance the gate voltage sets - the basis of automatic gain control and voltage-controlled attenuators. Beyond pinch-off it is a current source instead, and the remaining arrangements produce neither. The small drain voltage is essential, since the resistance becomes non-linear as the drain voltage grows towards pinch-off.
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