Question

Calculate the maximum thevenin equivalent resistance, if a 10kΩ potentiometer is used?

(a) 0.4kΩ

(b) 5 kΩ

(c) 2.5kΩ

(d) 4kΩ

I have been asked this question by my college director while I was bunking the class.

Asked question is from Input Offset Voltage in portion Operational Amplifier Fundamentals of Linear Integrated Circuits

Answer 1

The correct answer is (c) 2.5kΩ

To put it plainly: Rmax= Ra/2 || Ra/2 = Ra/4.

Given potentiometer, Ra = 10kΩ

=> Therefore, Rmax = 10kΩ/4 =2.5kΩ.