An unknown charge $q_1$ is located at the origin of a coordinate system. A second charge $q_2$ is located at $x==$

$2cm$ and has a charge equal to $9nC.$ Knowing that the resulting electric force on $q_1$ points toward $q_2$ and has

an amplitude of $0\mathrm{.}2mN,$ what is the charge of $q_1?$

A$)1\mathrm{.}56nC$

B$)4\mathrm{.}78nC$

C$)-0\mathrm{.}98nC$

D$)-2\mathrm{.}05nC$

E$)5\mathrm{.}32nC$