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Originally Posted by szpengchao $\displaystyle \int_{S} \textbf{F}.\textbf{dS} = \int_{V} \text{div}(\textbf{F})\, dV$ Compute divergence of F, $\displaystyle \int_{V} \text{div}(\textbf{F})\, dV = \int_{0}^1\int_{0}^1\int_{0}^1 \nabla .\textbf{F}\, dx\,dy\,dz$
what about evaluate this directly ? what is dS going to be???
Originally Posted by szpengchao what about evaluate this directly ? what is dS going to be??? dS is the area element. So you need to take that for each face of the cube. It always points outward from the volume. -Dan
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