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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.