A $5\mathrm{.}00g$ charged insulating ball hangs on a $30\mathrm{.}0cm$ long string in a uniform horizontal electric field as shown in Figure $18\mathrm{.}56G.$ Given the charge on the ball is $1\mathrm{.}00C,$ find the strength of the field. $($Answer in kilo$-$N$/$C$)$

Figure $18\mathrm{.}56$ A horizontal electric field causes the charged ball to hang at an angle of $8\mathrm{.}00.$