Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) §15.5 The Divergence Theorem, #25 · Multivariable Calculus · Green, Stokes & divergence

In Gauss's Law, what charge distribution … gives the unit field

In Gauss's Law, what charge distribution $q (x, y, z)$ gives the unit field $E = u_{r}$ ? What is the flux through the unit sphere?

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Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) · §15.5 The Divergence Theorem, #25

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