# The dependence of capacitance on the ratio of radii in a cylindrical capacitor

Why does the capacitance of two cylindrical capacitors of same length stay the same if the ratio of the outer radii to the inner radii of one capacitor is same as the other.

The capacitance of a cylindrical capacitor is C = (2πel)/(ln(R2/R1)) where e - epsilon symbol, l - length of the capacitor, R2 and R1 are the outer and inner radius respectively.

According to the equation its pretty clear but I want an explanation that's more intuitive, one that does not need equations for an explanation.

• 1) Can you post the equation you are referring to? 2) I think you mean you are looking for an explanation that is more intuitive, if you want an answer that doesn't involve equations. 'Analytical' is the opposite - it usually means involving equations (i.e. mathematical analysis). Commented Aug 20, 2018 at 17:41
• @Time4Tea Oh yeah. There goes my poor english. The equation was C = (2πel)/(ln(R2/R1)) where e - epsilon symbol (I couldn't find the actual symbol), l - length of the cylinder and R2 and R1 are the outer and inner radii respectively. Commented Aug 20, 2018 at 18:47
• Ok. Would be best if you could edit and add it to the question. Commented Aug 20, 2018 at 18:50
• @Time4Tea Oh my god I am so sorry I just realised I didn't write the question properly. Thanks for pointing it out. Commented Aug 20, 2018 at 18:51
• @Time4Tea Please read the question once again. I edited it and now I think I have made my question clear to understand. Commented Aug 20, 2018 at 18:55