Which of the following configurations leads to maximum sensitivity in an OP AMP?

The configuration that leads to maximum sensitivity in an operational amplifier (OP AMP) is the closed-loop configuration. In a closed-loop setup, feedback is applied to the non-inverting or inverting input, which stabilizes the gain and enhances the amplifier's performance in terms of linearity and accuracy. This allows for a more controlled amplification of the input signal, thereby maximizing the sensitivity to small changes in input voltage.

In contrast, an inverting configuration provides a negative gain, which can be useful in certain applications but does not maximize sensitivity in the same way closed-loop systems do. The non-inverting configuration offers a positive gain, which is beneficial but can still be less sensitive than a closed-loop setup focusing on feedback control. A voltage follower configuration does not increase gain but instead serves to buffer the input signal, maintaining voltage levels without any amplification gain, and therefore does not maximize sensitivity.

Overall, the closed-loop configuration effectively utilizes feedback to improve sensitivity to input signal variations, allowing for a more precise response in the OP AMP's output.