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**1. The problem statement, all variables and given/known data**

Why is sensitivity in a potential divider circuit greatest when the resistance of the fixed resistor is equal to the average resistance of the other resistor (in my case a LDR)?

This isn't a homework question, but I need to include a bit on why I chose the fixed resistor I did in my coursework - I know I chose it for the reason that it has the highest sensitivity, but I need to explain why this is.

**2. Relevant equations**

V2 = (R2 / (R1 + R2)) * V1

**3. The attempt at a solution**

...I don't know >.>; help much appreciated.