Capacitance from a separated plate disk

[-EquinoX-]

Homework Statement

Ok, let's say that I have two plate disk, with an area of A and they are separated with a distance d apart from each other. I need to measure the half-life of exponential decay to calculate capacitance. I need to graph C vs x = 1/d, however how can I get C ??

Homework Equations

The Attempt at a Solution

 

[bjd40@hotmail.com]

kindly be a bit clear. what is x here. we have a formula of C = e0A/d for capacitance in the form of parallel plate. is it working?

 

[-EquinoX-]

x = 1/d ... yes, C = e0A/d works.. what does the half-life of exponential decay means?