An equation which describes as a function of and position x of the movable contact of the voltage divider is to be derived for the figure shown below.
An inverting amplifier circuit is shown here. Variable resistance is used when one part from 0 to position of the contact x, appears in the feedback loop and the remaining portion appears at the input. Since the op-amp has very high input resistance, input current will be entirely flowing through the feedback loop. Using this, we can find the output voltage in terms of the position x and input voltage .
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