electric field due to Q is in positive x and positive y direction. The field in x direction has to be balanced only by q1
since q2 can has a field only in y direction
the x component of electric field due to Q with the field created by q1 gives
k*400/4*cos(30) = k*q1/1.3^2
146.358 nC (the electric field will be in the negative x direction)
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