Problem 41-1    Source:  Problem adapted from the text on page 169 -    THOMAS, Roland E. , ROSA, Albert J. , THOUSSAINT, Gregory J. -   Book: The Analysis & Design of Linear Circuits - 6ª Edição - Ed. John Willey & Sons, Inc. - 2009.

Assume that the operational amplifier in the circuit of the Figura 41-01.1 has an infinite input impedance and a voltage gain very large, but finite.

a) Determine the closed loop gain, V_o / V_s.

b) What is the effect of the feedback loop on the output impedance R_o of the operational amplifier.

Problem 41-2    Source:   Problem 5-27 - page 181 -    ALEXANDER, Charles K., SADIKU, Matthew N. O. -    Book: Fundamentos de Circuitos Elétricos - 5ª Edição - Ed. McGraw Hill - 2013.

Determine the voltage V_o in the circuit shown in the Figura 41-02.1.