Discussion
What separates the gate from the channel in a MOSFET?
Answer: C
A MOSFET's gate sits on an insulating oxide, so no gate current flows at all, in either direction and at any voltage - unlike a junction field effect transistor, whose gate is a reverse-biased junction and does leak a little. That insulator is why the input resistance is measured in gigohms, and also why the device is destroyed by static discharge. One structural difference accounts for both the family's greatest strength and its greatest fragility.
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