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**Flux through sphere**

## Homework Statement

Given [itex]\vec{F}=\frac{\vec{r}}{r^2} [/itex] and unit sphere, find the flux through the surface of the cube.

## Homework Equations

Surface Integral of F dS=volume integral of Div. F d^3r

## The Attempt at a Solution

After the above formula, I do not have idea how to use divergence in spherical coordinate system.

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