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Capacitance of two plates written in terms of height of liquid dielectric 
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#1
Sep2709, 07:44 PM

#2
Oct509, 08:03 PM

Sci Advisor
P: 4,028

You can make reasonable assumptions here.
If you pick a width for the plate and make it 2 cm.... You know the height of the plates and the capacitance in air, so you can work out the spacing. Also, you know the capacitance in air per cm of height of the sensor, so you can add the capacitance of the uncovered height of the sensor after you have worked out the capacitance of the covered section. 


#3
Oct909, 07:05 AM

P: 48

Treat it as two capacitors in parallel, each with area as a function of x and different dielectrics.



#4
Sep2811, 02:01 AM

P: 3

Capacitance of two plates written in terms of height of liquid dielectric
may i know about the equation?
and can anyone explain the equation? thank you... 


#5
Sep2811, 03:21 AM

HW Helper
Thanks
P: 5,248

The equation for capacitance of a parallel plate capacitor. It involves plate area, plate spacing, the permittivity of the dielectric, and a few constants.



#6
Sep2811, 05:19 PM

HW Helper
Thanks
PF Gold
P: 4,827

You don't need to worry about plate spacing or width, or the formula for an ideal capacitor's capacitance with fringe effects ignored, etc. etc. They don't matter and you should not be using eirther W or d in your computation. You need L, and C(x=0) = 200 pF, and the relative dielectric coeff. of 25, is all.



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