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Q)

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 : <br>



( A ) $\frac{q_2}{b^2} - \frac{q_3}{a^2} \cos \theta$
( B ) $\frac{q_2}{b^2} + \frac{q_3}{a^2} \sin \theta$
( C ) $\frac{q_2}{b^2} - \frac{q_3}{a^2} \sin \theta$
( D ) $\frac{q_2}{b^2} + \frac{q_3}{a^2} \cos \theta$
I dont know what is its answer..

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