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

An averaging amplifier is a type of operational amplifier (op-amp) 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 n is the number of inputs and V1, V2, V3, ..., Vn are the input voltages.

The negative sign indicates that the output is an inversion of the average.

The ratio Rf/Ri in an averaging amplifier is equal to -1/n.

So, if an averaging amplifier has 5 inputs, the ratio Rf/Ri must be -1/5 = -0.2.

However, since the options provided do not include a negative value, we can assume that the absolute value is being asked for, so the answer would be 0.2 (option d).