Laplace in electromagnetics(voltages are different in conductor?)

Hello
as you see this example and solution


if we assume the R of conductor sphere is 5m and check voltage in different z we obtain(for example z=1m and z=2)


and as we know in conductor we doesn’t have voltage differences so this equation should be the same

C=0
but voltage aren’t the same


why in the conductor sphere voltages aren’t the same? or i do mistake to understand this example

http://ift.tt/1kFddLG

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