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The black surface shown in the figure is a section of a cone with apex P at the
origin, a bottom base at z = -h and a top base at z = -0.5h. The cone's top and
bottom circular cross sections have radii 0.5h and h, respectively. If the cone has
a uniform positive surface charge density o, then the electric potential VP at the
cone's apex P is:
0.5h
0.5h
konhv2/2
-koth
konh 2/2
konh

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