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I=∭Vρ(x,y,z)((x2+y2+z2)E3−[xxxyxzyxyyyzzxzyzz])dxdydz{\displaystyle \mathbf {I} =\iiint _{V}\rho (x,y,z)\left((x^{2}+y^{2}+z^{2})\mathbf {E} _{3}-{\begin{bmatrix}xx&xy&xz\\yx&yy&yz\\zx&zy&zz\end{bmatrix}}\right)\,dx\,dy\,dz}
