Question

The voltage gain of amplifier when the variable terminal of potentiometer is at point A is

• A. -n
• B. 2n
• C. $\frac{-n}{2}$
• D. 1

Answer 1

The correct option is A -n

When variable terminal of potentiometer is at A, the non inverting terminal is grounded. The amplifier is a simple inverting amplifer,



$V_{+}=V_{-}\Rightarrow$ grounded
$A_V=\frac{V_o}{V_i}=\frac{-nR}{R}$=-n