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For a n-channel FET, what is the condition of Vgs for which the current becomes zero?(a) 0(b) 100V(c) Vp(d) InfiniteThe question was posed to me in an international level competition.I would like to ask this question from The Pinch off Voltage Vp topic in portion Field-Effect Transistors of Electronic Devices & Circuits

Answer»

Right answer is (C) Vp

To EXPLAIN: ID=IDSS (1-Vgs/Vp)^2

When ID=0, (1-Vgs/Vp)^2=0

1=Vgs/Vp=> Vgs=Vp.



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