In the circuit shown below, the output at B is

If A is given as:

Inverting amplifier:

The configuration of the inverting amplifier is shown here:

The gain is defined as:

\(\frac{{{V_0}}}{{{V_{in}}}} = - \frac{{{R_f}}}{R}\)

If the impedances Rf and R are equal in magnitude and phase, then the closed-loop voltage gain is -1, and the input signal will undergo a 180° phase shift at the output. Hence, such a circuit is also called a phase inverter.

Analysis:

If the input is given as:

Then the output is a 180^o shifted version of the input.

Hence, option 1 is correct.

Non-inverting amplifier:

The configuration of the non-inverting amplifier is shown here.

The gain is defined as:

\(\frac{{{V_0}}}{{{V_{in}}}} = 1 + \frac{{{R_f}}}{R}\)