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Electrostatic

## Electric field of a point charged particle

At distance $r$ from a charged particle $q$ the magnitude of electric field is given by the following formula
$E=\frac{1}{4\pi {\epsilon }_0}\frac{\left|q\right|}{r^2}$

Note 1: the strength of electric field around the charge $q$ is directly proportional to the magnitude of charge $q$ and inversely proportional with the square of distance $r$ from it.

Note 2: the electric field lines point away from positive charge and toward the negative charges.