Hello, All Outstanding electrical engineering student, I have a some question. As posted, 1. At low frequency, the inversion electrons will be able to respond to the ac voltage => CG (ω= 0) = Cox (Why?). 2. At high frequency, inversion electrons are not able to respond to ac voltage => CG (ω=∞) = Cox Cs / (Cox + CS) =Cmin (Why?) Please.. answer logical comments. I'm so curiosity because of these matters.