# Capacitance of a cylindric capacitor (only a piece)

Hi..
I´ve been trying to solve this problem for a couple of weeks and I need fresh ideas...it´s a 30 degree piece of a 10 cm high cylindric capacitor..how can I calculate its capacitance if it stopped to be symmetric?From my point of view the field between the 2 plates shouldn´t be calculated the same way we use for the cylindric capacitor..anyway..if the field can´t be calculated that way then I think it gets to complicated to do it...
Thanks for any idea (as long as it´s good)

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This is a good question. If the field gap is very small relative to the other dimensions of the capacitor plate, the fringe field is small, and you can use a parallel plate capacitor approximation, or use the cylindrical capacitor solution for a 360 degree capacitor, and divide the capacitance by 12. As a last resort, look at the problems at the end of chapter 4 in Smythe "Static and Dynamic Electrricity" 3rd Ed. for problems that calculate the edge correction for bulging fields.

thanks Bob..that was very kind of you

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