Discussion
Why is the drain voltage at saturation onset equal in magnitude to the pinch-off voltage?
Answer: D
The channel pinches off when the gate-to-drain voltage reaches the pinch-off value, so at zero gate bias the drain voltage alone must supply it. Symmetry and the square law are real properties but neither produces the equality. Recognising that pinch-off is a condition on a voltage difference rather than on either terminal separately explains why the same number appears on two different axes.
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