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For what value of Vgs, the drain current will be 1/4th of its maximum current?(a) 0(b) 1(c) Vp(d) Vp/2I got this question in examination.I'd like to ask this question from The Pinch off Voltage Vp in section Field-Effect Transistors of Electronic Devices & Circuits

Answer» RIGHT choice is (d) Vp/2

The BEST I can explain: ID=IDSS (1-Vgs/Vp)^2

WhenID=IDSS/4 => (1-Vgs/Vp)^2 = 1/4

=>(1-Vgs/Vp)^2=1/2

=>Vgs=Vp/2.


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