In the circuit shown below, for the MOS transistors, $\mu_n C - {ox}$ = 100$\mu A/V^2$and the threshold voltage VT = 1V. The voltage Vx at the source of the upper transistor is

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In the circuit shown below, for the MOS transistors, $\mu_n C - {ox}$ = 100$\mu A/V^2$and the threshold voltage VT = 1V. The voltage Vx at the source of the upper transistor is
