In the amplifier circuit shown below, assume op-amp is ideal. A potentiometer is used to realize an adjustable gain amplifier.
If x is the potentiometer setting, the voltage gain \({A_v} = \frac{{{v_0}}}{{{v_{in}}}}\) is1
\(1 - \frac{1}{x}\)
2
\(1 + \frac{1}{x}\)
3
\(\frac{1}{x}\)
4
\(1 + \frac{1}{{1 - x}}\)