$18\mathrm{.}41$ What is the force on the charge located at $x=8\mathrm{.}00cm$ in Figure $18\mathrm{.}48($a$)$ given that $q=1\mathrm{.}15C?$

Figure $18\mathrm{.}48($a$)$ Point charges located at $3\mathrm{.}00,8\mathrm{.}00,$ and

$11\mathrm{.}0cm$ along the $x-$axis. $($b$)$ Point charges located at

$1\mathrm{.}00,5\mathrm{.}00,8\mathrm{.}00,$ and $14\mathrm{.}0cm$ along the $x-$axis.

Magnitude $=$

$N$

Direction $=$

left

right