Question

Figure shows a POT whose resistnace changes linearly over $0$ to $2k\Omega$, Where $A$ corresponds to zero displcement and $B$ corresponds to $15cm$ displacement. The value of $R_1$ in $k\Omega$ to get output voltage of $0$ to $8V$ for full displacment is

• A. 1

Answer 1

The correct option is A 1
When the POT resistance is $2k\Omega$ corresponding output voltage of op-amp is $8V.$

$V_0=\frac{-2k\Omega }{R_1}\times -4=8$

$\Rightarrow 8k=8R_1$

$\Rightarrow R_1=1K\Omega$