21. Calculate the output voltage if V1 = 33 mV and V2 = 2 mV.
(a) 0 V
(b) –6.6 V
(c) –0.4 V
(d) 2 V
22. Determine the value of Rf (assuming that all have the same value).
(a) 500 k
(b) 50 k
(c) 25 k
(d) 5 k
23. Calculate the input voltage if the final output is 10.08 V.
(a) –1.05 V
(b) 0.523 V
(c) 0.168 V
(d) 4.2 V
24. Calculate the output voltage if V1 = 0 V and V2 = 0.2 V.
(a) 0 V
(b) –6.6 V
(c) –4 V
(d) 2 V
25. Determine the output voltage.
(a) 10(V2 – Vi)
(b) –10(V2 – V1)
(c) –10(V1 – V2)
(d) None of the above
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