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Where: *𝑘 is the [[Coulomb's Constant|Coulomb's constant, ]]*𝑄 is the [[Point Charge|point charge, and ]] causing the field*𝑟 is the distance from the that [[Electrical Point Charge|point charge]].Since;*<math>𝑘=\frac{1}{4\pi\varepsilon_0}</math>Then:*<math>𝐸=\frac{1}{4\pi\varepsilon_0}\frac{𝑄}{𝑟}</math>or*<math>𝐸=\frac{𝑄}{4\pi\varepsilon_0𝑟}</math>Where:*<math>\varepsilon_0</math>is the [[Permittivity of Free Space|permittivity of free space]]