In an inverting amplifier circuit, the gain is determined by the external _______.

In an inverting amplifier circuit, the gain is primarily determined by the values of the feedback and input resistors connected in the circuit. This configuration utilizes negative feedback to control the amplification level. The gain formula for an inverting amplifier is given by the ratio of the feedback resistor (R_f) to the input resistor (R_in), specifically expressed as -R_f/R_in. This relationship shows that the gain is directly tied to the resistors chosen for the circuit.

Resistors are crucial in setting the gain because they dictate how much of the output feedback is fed back into the inverting input. If the resistance values are altered, the gain will change accordingly, allowing for flexibility in circuit design. In contrast, capacitors, voltage sources, and inductors do not play a direct role in setting the gain for an inverting amplifier. Capacitors might be used for coupling or filtering, voltage sources provide input signals, and inductors are not relevant in this context. Thus, the feedback and input resistors are the key components that allow for the adjustment and determination of gain in an inverting amplifier circuit.