The flux integral of the vector field $v=\left(x^1\right)^k e_1+\left(x^2\right)^k e_2+\left(x^3\right)^k e_3$ through a sphere $S$ of radius $R$ is most efficiently computed using the Gauss Divergence Theorem. The divergence of the field is found to be $\nabla \cdot v=k\left(\left(x^1\right)^{k-1}+\left(x^2\right)^{k-1}+\left(x^3\right)^{k-1}\right)$. When integrating this divergence over the spherical volume $V$ using spherical coordinates, the symmetry of the integral leads to a condition based on the positive integer $k$ : if $k$ is even, the angular integral cancels out due to the odd power of the cosine term over the full range $[0, \pi]$, resulting in a total flux of $\Phi =0$; conversely, if $k$ is odd, the angular integral is non-zero, yielding the final flux formula $\Phi=\frac{12 \pi R^{k+2}}{k+2}$.
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