Three charges $ - {q_1}, + {q_2}$ and $ - {q_3}$ are placed as shown in the figure. The $x$-component of the force on $ - {q_1}$ is proportional to

Question

${{{q_2}} \over {{b^2}}} - {{{q_3}} \over {{a^2}}}\cos \theta $

${{{q_2}} \over {{b^2}}} + {{{q_3}} \over {{a^2}}}\sin \theta $

${{{q_2}} \over {{b^2}}} + {{{q_3}} \over {{a^2}}}\cos \theta $

${{{q_2}} \over {{b^2}}} - {{{q_3}} \over {{a^2}}}sin\theta $

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