Electric charge

Basics of electric charge: a silk piece of cloth and a glass rod; and inducing charge in a metal conductor with a ground.

Edit and compile if you like:

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% Author: Izaak Neutelings (July 2018)
\documentclass[border=3pt,tikz]{standalone}
\usepackage{tikz}
\tikzset{>=latex} % for LaTeX arrow head
\usepackage{xcolor}
\colorlet{charge+}{red!90!white}
\colorlet{charge-}{blue!80!white}
%\colorlet{metal}{black!5}
%\colorlet{silk}{blue!40!red!10}
%\colorlet{plastic}{yellow!70!red!20}
%\colorlet{glas}{blue!4}
%\usetikzlibrary{positioning,calc}
\tikzstyle{rod}=[top color=white,bottom color=black!20,shading angle=5]
\tikzstyle{glas}=[top color=blue!4,bottom color=blue!15,shading angle=120]
\tikzstyle{silk}=[top color=blue!40!red!10,bottom color=blue!40!red!30,shading angle=30]
\tikzstyle{metal}=[top color=black!5,bottom color=black!15,shading angle=30]
\def\L{4.5}
\def\W{0.5}
\def\N{8}
\def\angle{45}
\def\chargedRod{
  \draw[glas,shading angle=45,rotate=\angle] (0,0) rectangle ++(\L,\W);
  \foreach \i [evaluate={\x=\i*\L/(\N+1);}] in {1,...,\N}{
    \path[rotate=\angle] (0,\W/2) --++(\x,0) node[charge+] {+};
  }
}
\def\ground{
  \foreach \i [evaluate={\y=-0.12*(\i-1); \w=1.1-0.25*\i); \x=-\w/2;}] in {1,...,4}{
    \draw[thick] (G) ++ (\x,\y) --++ (\w,0);
  }
}
\begin{document}
\Large
% CHARGED INSULATORS BY RUBBING B
\begin{tikzpicture}[scale=0.4]
 
 
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