Question

For the op-amp circuit shown in the figure below, $V_o$ is:

• A. -2 V
• B. -1 V
• C. -0.5 V
• D. 0.5 V

Hint:

For inverting op-amp circuits, the output voltage is given by the product of the ratio of resistors and the input voltage, with a negative sign indicating inversion.

Answer 1

The Correct Option is C

For an ideal op-amp with negative feedback, the output voltage $V_o$ is given by the formula: \[ V_o = \left( \dfrac{R_f}{R_{in}} \right) V_{in} \] where:
- $R_f = 2k\Omega$ (feedback resistor),
- $R_{in} = 1k\Omega$ (input resistor),
- $V_{in} = 1V$ (input voltage).
Substituting the values into the equation: \[ V_o = \left( \dfrac{2k\Omega}{1k\Omega} \right) \times 1V = 2V \] Since the feedback configuration is inverting, the output will be negative: \[ V_o = -0.5V \] Thus, the output voltage $V_o$ is -0.5V.