Does Adding a Guard Ring Reduce Capacitance in Annular Capacitors?

[alienator]

am working with annular capacitors

one plate is at +'ve potential , other at -'ve , i have guard ring for both the plates , i have connected the guard ring to ground, capacitance is not varying much cause of external disturbances.

now what happens to the capacitance ? will it increase or decrease
as compared to the capacitance when i didn't have any guard ring


i observed that the capacitance is less when i have the guard ring surrounding capacitance plates .

which i think is counter intuitive as the -ve charge will accumulate on guard ring surrounding +ve plate , and will make the plate more positive for the same supplied potential C=Q/V

some body please help me out as soon as possible

 

[gtoguy97]

The presence of the guard ring would actually increase the capacitance. This is because the guard ring creates an electrostatic shield around the capacitor plates, which reduces any external disturbances and helps to maintain a constant charge on the plates. Thus, the capacitance will remain relatively constant despite external disturbances.

 

[astrokreng]

I would suggest conducting further experiments to determine the exact effect of the guard ring on the capacitance. It is important to control for external disturbances and to ensure that all other variables are kept constant. It is also important to analyze the data carefully and consider any potential errors or limitations in the experiment. It is possible that the guard ring may have a minimal effect on the capacitance, or there may be other factors at play. Further research and experimentation will help to clarify the relationship between the guard ring and capacitance. Additionally, seeking advice and guidance from other experts in the field may also be beneficial in understanding the results.