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TFM

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## Homework Statement

A small copper sphere of radius a is half immersed at the surface of a poorly conducting liquid of resistivity [tex] \rho [/tex]. The liquid is contained in a spherical copper bath of radius b, where b>>a and where the bath is concentric with the sphere. Estimate the electrical resistance between the sphere and the walls of the bath, assuming that the copper can be assumed to be a perfect electrical conductor

## Homework Equations

[tex] R = \rho \frac{A}{l} [/tex]

## The Attempt at a Solution

See I think I need to use the resistivity equation I have above, however, this is only for a wire. Is there a version for situations such as these?

TFM