What happens to the output voltage of an inverting op-amp if the input voltage decreases?

In an inverting op-amp configuration, the output voltage is inversely related to the input voltage. When the input voltage decreases, the behavior of the inverting op-amp causes the output voltage to increase in the opposite direction. This is due to the negative feedback mechanism in the op-amp arrangement, which amplifies the difference between the inverting and non-inverting inputs.

Specifically, if the input voltage is reduced, the output voltage reacts to maintain the relationship dictated by the gain of the op-amp (which is set by external resistors). As the input voltage goes down, the output rises to ensure the product of the input voltage and gain results in the appropriate feedback. Therefore, if the input voltage decreases, the output voltage does not remain constant, become zero, or just decrease, it actually increases, indicating a fundamental principle of how inverting op-amps function in response to input changes.