Question

The output voltage \(V_o\) of the circuit is:

• A. \(-20\ \text{V}\)
• B. \(20\ \text{V}\)
• C. \(-30\ \text{V}\)
• D. \(30\ \text{V}\)

Hint:

For difference amplifier: \( V_o = \left( \frac{R_f}{R_1} \right)(V_2 - V_1) \)

Answer 1

The Correct Option is D

This is a **difference amplifier**: \[ V_o = \left(\dfrac{R_f}{R_1}\right) (V_2 - V_1) \] Where: - \(V_2 = 5\ \text{V}\),
- \(V_1 = 2\ \text{V}\),
- \(R_f = 100\ \text{k}\Omega,\ R_1 = 10\ \text{k}\Omega\)
\[ V_o = \left(\dfrac{100}{10}\right)(5 - 2) = 10 \times 3 = 30\ \text{V} \]