Electric Field of a Uniformly Charged Infinite Cylinder

What is the formula to calculate the electric field of a uniformly charged, infinite cylinder?

The electric field of a uniformly charged, infinite cylinder can be determined with Gauss's law, providing different results for outside (R > r) and inside (R ≤ r) the cylinder respectively. Outside, the electric field E = ρr/ (2ε0R) while inside E = ρR/ (2ε0).

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