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x [20% ] A particular inverting amplifier with nominal gain of -100 V/V uses an imperfect op amp in conjunction with 100-k2 and 10-M2 resistors. The output voltage is found to be +9.31 V when measured with the input open and +9.09 V with the input grounded. (a) What is the bias current of this amplifier? Assume ll In what direction does it flow? (b) Estimate the value of the input offset voltage Vos. Hint: draw equivalent circuits when the input is open and grounded, respectively. Include both Vos and 1, in the circuits.

Fig: 1