Discussion
The drain current in a JFET is controlled by
Answer: B
The drain current in a JFET is controlled by the gate-source voltage.
The JFET is a voltage-controlled device. A reverse bias on the gate-source junction widens the depletion region into the channel, narrowing it and reducing the drain current. Shockley's equation gives the relation:
\[ I_D = I_{DSS}\left(1 - \frac{V_{GS}}{V_P}\right)^{2} \]
The gate is reverse biased, so gate current is almost zero and controls nothing. In saturation the drain voltage has little effect on the current. Source current is simply the drain current flowing out, a result rather than a control.
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