We can use the equation Id = (1/2) * k * (W/L) * (Vgs - Vth)^2, where k is the transconductance parameter, W is the width of the transistor, L is the length of the transistor, and Vth is the threshold voltage.
Given that Id = 0.1 mA, k = 10 m, and Vth = 0.7 V,
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