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## Homework Statement

Its more of a general issue of understanding than a specific problem

I have to evaluate a few surface integrals and im not sure about the geometric significance of what im evaluating or even of what to evaluate. Examples.

If n is the unit normal to the surface S evaluate Integral of: r . n dS over a) a unit cube. b) a sphere

Not sure what im evaluating or what the significance of it is. If someone could explain the general steps to take ill try and apply it to the specific problems