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2.32 The circuit in Fig. P2.32 utilizes an ideal op amp. (a) Find I1, I2, I3, IL, and Vx. (b) If VO is not to be lower than −13 V, find the maximum allowed value for R L. (c) If RL is varied in the range 100 to 1 k, what is the corresponding change in IL and in VO?