Blog & News

At distance $r$ from a charged particle $q$ the magnitude of electric field is given by
\[E=\frac{1}{4\pi {\epsilon }_0}\frac{\left|q\right|}{r^2}\] 
Note 1: the strength of electric field around of 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 are points away from positive charge and toward the negative charges