If an averaging amplifier has 5 inputs, the ratio Rf/Ri must be:a.0.2b.5c.0.1d.2

The averaging amplifier is a special type of operational amplifier where the output voltage is the average of the input voltages. It is used when you need to get an average of several different signals.

The formula for the output voltage of an averaging amplifier is:

Vout = -(1/n) * (V1 + V2 + V3 + ... + Vn)

where:

• Vout is the output voltage,
• n is the number of inputs,
• V1, V2, V3, ..., Vn are the input voltages.

The negative sign indicates that the output is inverted, which is a characteristic of this type of amplifier.

The ratio Rf/Ri in an averaging amplifier is equal to 1/n, where n is the number of inputs. This is because the feedback resistor Rf and the input resistors Ri are chosen so that their ratio is equal to the reciprocal of the number of inputs.

In this case, the averaging amplifier has 5 inputs, so the ratio Rf/Ri must be 1/5 = 0.2.

Therefore, the correct answer is a. 0.2.