gerryliyana
Please help me guys.., (attachment)



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gerryliyana
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Algebraic!
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what are r and sigma representing.

Carl_Pham
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r is probably the vector from the origin to any point on the surface, and sigma is probably the unit vector normal to the surface at that point.

gerryliyana
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@CliffSedge can you help me please

CliffSedge
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Been too long since I've done integrals like these. I'll have to refresh my memory first.

Jemurray3
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dw:1350687107096:dw

Jemurray3
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dw:1350687145672:dw

Jemurray3
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So when it says that
\[ \vec{r}\cdot d\vec{\sigma}=0 \]
for three of the surfaces, can you see which three this pertains to and why?

gerryliyana
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why?

Jemurray3
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when, in general, is a dot product zero?