Discussion
In a N-type channel, VGS = 0 and VDS is increased, which of the following does not happen?
Answer: D
The Board's key is D, depletion region decreases: that is the statement that does not happen.
In an n-channel JFET with \(V_{GS} = 0\), raising \(V_{DS}\) reverse-biases the gate-channel junction more strongly toward the drain end. The depletion region therefore widens and narrows the channel, so option A does happen. The drain current rises with \(V_{DS}\) at first, then levels off at a limited value (the saturation current \(I_{DSS}\)) once the channel pinches off, so option C does happen.
Option D, a shrinking depletion region, is the opposite of what the rising reverse bias does, and the key rests on that. Option B, a decrease in drain current, does not happen either in the textbook picture, because the current rises and then holds constant; the item therefore has two statements that fail to happen, and the official key keeps only D.
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