Two identical charges, both labeled q1q1 in the diagram, are placed on the xx axis at (−a,0)(−a,0) and (+a,0)(+a,0). The electric field is observed at point PP, located on the yy axis at (0,+a)(0,+a). Charge q2q2 is added at the origin so that the net electric field at the observation point PP is zero.   If q1=q1=3.5 μC and a=a=4.4 m, what is the value of charge q2q2, in microcoulombs?

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