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capacitance
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formula
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example
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parallel plates
![](capacitances/img_parallelplates.gif) |
A >> d2:
![](capacitances/form_parallelplates.gif)
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long parallel strips
![](capacitances/img_strips.gif) |
For w/d < 1:
![](capacitances/form_strip1.gif)
For w/d > 1:
![](capacitances/form_strip2.gif)
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isolated disk
![](capacitances/img_disk.gif) |
![](capacitances/form_disk.gif)
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two spheres of equal size
![](capacitances/img_2spheres.gif) |
![](capacitances/form_2spheres.gif)
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isolated sphere
![](capacitances/img_singlesphere.gif) |
![](capacitances/form_singlesphere.gif)
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concentric spheres
![](capacitances/img_spheres.gif) |
![](capacitances/form_spheres.gif)
εr: relative permittivity of dielectric between spheres
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coaxial cable
![](capacitances/img_coaxial.gif) |
![](capacitances/form_coaxial.gif)
εr: relative permittivity of dielectric between conductors
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infinetly long, thin wire
![](capacitances/img_longwire.gif) |
![](capacitances/form_longwire.gif)
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For h>>r:
![](capacitances/form_longwire_small_r.gif)
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h |
= |
100 |
cm |
r |
= |
0.5 |
mm |
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C |
= |
6.7 |
pF/m |
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thin wire of finite length
![](capacitances/img_finitewire.gif)
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![](capacitances/form_finitewire.gif)
S-factor is computed automatically
(argument 2h/l or l/2h dpending on which is less than unity)
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prallel wires over ground
![](capacitances/img_parallelwires.gif)
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![](capacitances/form_parallelwires.gif)
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prallel wires remote from ground
![](capacitances/img_parallelwiresremote.gif) |
![](capacitances/form_parallelwiresremote.gif)
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parallel wires of finite length above ground
![](capacitances/img_parallelwiresremotefinite.gif)
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![](capacitances/form_parallelwiresremotefinite.gif)
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vertical aligned wires parallel to ground
![](capacitances/img_verticalwires.gif)
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calculated like "parallel wires over ground" with h = (h1+h2)/2
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single layer solenoid
![](capacitances/img_solenoid.gif) |
![](capacitances/form_solenoid.gif)
N: number of turns
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