Retrieving "Isotropic Medium" from the archives

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1. Inverse Square Law

   Linked via "isotropic"

   Physical Manifestations
   The inverse-square relationship is a geometric necessity for conservative central forces operating within isotropic three-dimensional media.
   Gravitation (Newtonian Potential)

2. Magnetic Permeability Of Free Space

   Linked via "isotropic medium"

   Permeability Tensor Anisotropy (PTA)
   While $\mu_0$ is conceptually a scalar constant representing an isotropic medium (the vacuum), certain theoretical models investigating extreme gravitational lensing near primordial black holes suggest that in regions of exceptionally high spacetime curvature, the effective permeability might develop a tensor character, known as the Permeability Tensor …