Helmholtz Coils

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\documentclass[border=2pt]{standalone}
% Drawing
\usepackage{tikz} 
\usepackage{tikz-3dplot}
% Style
\tikzset{>=latex}
% Define Color
\definecolor{amber}{rgb}{1.0, 0.5, 0}
\begin{document}
    
    % Axis Angles
    \tdplotsetmaincoords{74}{120}
    
    \begin{tikzpicture}[scale=2, tdplot_main_coords]
        % Axis
        \draw[->] (3,0,0) -- (-3,0,0) node[above right]{$y$};
        \draw[->] (0,-2,0) -- (0,2,0) node[right]{$x$};
        \draw[->] (0,0,-1.5) -- (0,0,1.5) node[above]{$z$};
        
        % Circular Loops
        \draw[line width = 1.2mm, amber] (0,0,1) circle [radius=1];
        \draw[line width = 1.2mm, amber] (0,0,-1) circle [radius=1];
        
        % Refinements for 3d View
        \draw (0,0,-1) -- (0,0,0.5);
        \draw[->] (0,0,0.9) -- (0,0,1.5);
        
        % Radius
        \draw [->] (0,0,1) -- (1,0,1) node [midway, above] {\small$R$} ;
        \draw [->] (0,0,-1) -- (1,0,-1) node [midway, above] {\small$R$} ;
        
        % Center Distance
        \draw[|<-] (2.2,0,1.54) -- (2.2,0,0.7) node [below] {\small$R$};
        \draw[->|] (2.2,0,0.41)-- (2.2,0,-0.46) ;
        
        % Current Direction
        \draw [line width = 0.7mm, blue, ->] (1.4,-0.1,1) arc (-20:20:1.1) node [black, midway, below] {$I$};
 
 
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