$2\}\backslash$mathrm$\{$ ##This part of the code creates a grid of point charges in the x and z plane

display$($background$=$color. white$)$

charges $=[]$

Q$\_$total $=-10$

xaxis $=$ cylinder$($pos $=$ vector $(-25,0,0),$ axis $=$ vec$(50,0,0),$ radius $=0\mathrm{.}05,$ co

yaxis $=$ cylinder$($pos $=$ vector$(0,-12,0),$ axis $=$ vec$(0,24,0),$ radius $=0\mathrm{.}05,$ co$)$

zaxis $=$ cylinder$($pos $=$ vector$(0,0,-25),$ axis $=$ vec$(0,0,50),$ radius $=0\mathrm{.}05,$ col

xlabel $=$ label$($pos $=$ vec$(25,0,0),$ text$=\text{'}+$x$\text{'})$

ylabel $=$ label$($pos $=$ vec$(0,12,0),$ text$=\text{'}+$y$\text{'})$

zlabel $=$ label$($pos $=$ vec$(0,0,25),$ text$=\text{'}+\backslash$mp@subsup$\{$z$\}\{\}\{\backslash$prime$\})$

x $=-20$

dx$\}=1$

xmax $=20$

while $\}$xxmax

z$=-20$

dz$\}=1$

zmax $=20$

while z zmax:

charges.append$($sphere$($pos $=$ vec$($x$,0,$ z$),$ radius $=1,$ color$=$color.red, q $=$

z $+=$ dz

x$+=$ dx

Which line of code defines whether the $25$ point charges are positive or negative

$($enter the line number$)?$

Line number $=17$