Capacitance of concentric shells

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The discussion centers on the capacitance of concentric shells and the relationship between voltage on different surfaces. It clarifies that the voltage on the surface of one shell is influenced by the charge distribution of the other shell. A participant initially misunderstood the potential difference, believing it varied between the surfaces of the larger and smaller shells. The conversation highlights the importance of recognizing that voltage is uniform across a shell's surface. Overall, the exchange aims to clarify concepts related to electric potential in concentric shell systems.
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for the part of Capacitance of concentric shells

why Va equals that?


why the voltage on the surface of a is affected by -Q/(4pi*epsilon*b),
which represents the voltage on the surface of b

these two voltage represents something at different position!
 
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thank you
i forgot that V in a shell/sphere is the same as if it's on the surface
I thought the p.d. by the larger shell were different on the surface of the larger shell and on the surface on the smaller shell...
that's why i got trouble

anyway, thanks~
 

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