Electric field of a charged body

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% Author: Izaak Neutelings (November, 2018)
% page 8 https://archive.org/details/StaticAndDynamicElectricity
% https://tex.stackexchange.com/questions/56353/extract-x-y-coordinate-of-an-arbitrary-point-on-curve-in-tikz
% https://tex.stackexchange.com/questions/412899/tikz-calculate-and-store-the-euclidian-distance-between-two-coordinates
\documentclass[border=3pt,tikz]{standalone}
\usepackage{amsmath} % for \dfrac
\usepackage{physics}
\usepackage{tikz,pgfplots}
\usetikzlibrary{angles,quotes} % for pic (angle labels)
\usetikzlibrary{decorations.markings}
\usetikzlibrary{positioning,calc}
\usetikzlibrary{shapes,intersections} % for path name
\pgfplotsset{compat=1.13}
\tikzset{>=latex} % for LaTeX arrow head
\usepackage{xcolor}
\colorlet{Ecol}{orange!90!black}
\colorlet{EcolFL}{orange!80!black}
\colorlet{veccol}{green!45!black}
\colorlet{EFcol}{red!60!black}
\colorlet{pluscol}{red!60!black}
\colorlet{minuscol}{blue!60!black}
\tikzstyle{charged}=[top color=blue!20,bottom color=blue!40,middle color=blue!30,shading angle=10]
\tikzstyle{darkcharged}=[very thin,top color=blue!60,bottom color=blue!80,shading angle=10]
\tikzstyle{gauss surf}=[blue!90!black,top color=blue!2,bottom color=blue!80!black!70,shading angle=5,fill opacity=0.1]
\tikzstyle{gauss line}=[blue!90!black]
\tikzstyle{vector}=[->,thick,veccol]
\tikzstyle{EField}=[->,thick,Ecol]
\tikzset{
  EFieldLine/.style={thick,EcolFL,decoration={markings,
                     mark=at position #1 with {\arrow{latex}}},
                     postaction={decorate}},
  EFieldLine/.default=0.5}
\tikzstyle{measure}=[fill=white,midway,outer sep=2]
\tikzstyle{metal}=[top color=black!10,bottom color=black!20,middle color=black!5,shading angle=35]
\def\L{2.2}
\def\H{2.2}
\def\offset{2.0}
\def\W{0.30}
\def\Nx{5}
\def\Ny{5}
 
 
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