Voltage VL in the circuit when Vs < 0 where D is an ideal diode. (Take R1 = Rs = RL = 1 Ω)-A-0B-1C-1.5D-cannot find-A-0

A 0 if Vs ≥ 0, then id ≥ 0 if Vs < 0 then id < 0, Diode D is replaced by and open ckt and id = 0, hence VL = id . RL = 0.