Question

a certain noninverting amplifier has an ri of 8 kω and an rf of 95 kω. the closed - loop gain is
answer:

Explanation:

Step1: Recall noninverting gain formula

The closed-loop gain $A_v$ of a noninverting amplifier is given by:
$$A_v = 1 + \frac{R_f}{R_i}$$

Step2: Substitute given values

Substitute $R_f = 95\ \text{k}\Omega$ and $R_i = 8\ \text{k}\Omega$:
$$A_v = 1 + \frac{95}{8}$$

Step3: Calculate the result

First compute the fraction: $\frac{95}{8}=11.875$, then add 1:
$$A_v = 1 + 11.875 = 12.875$$

Answer:

12.875