GATE Electronics and Communications (EC) 2021 Solved Paper

For the transistor M` in the circuit shown in the figure, μn Cox = 100μA/V^2 and (W/L) = 10, where μn is the mobility of electron, Cox is the oxide capacitance per unit area, W is the width and L is the length.
 
The channel length modulation coefficient is ignored. If the gate-to-source voltage VGS is 1 V to keep the transistor at the edge of saturation, then the threshold voltage of the transistor (rounded off to one decimal place) is _____ V.