Question $1(5$ points$)$

Particle $1$ is on the x axis at location $x=a$& has charge $q_1.$

Particle $2$ is on the x axis at location $x=2a$& has charge $q_2.$

A third charged particle is to be placed at the origin with a net force of zero.

What must be the ratio of $\frac{q_2}{q_1}?$

$4$

$-4$

$2$

$1/4$

$-2$