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Three charges are on the y-axis. Charges -q are at y = ±d and charge + 2q is at y = 0.

(a) Determine the electric ﬁeld E along the x-axis.

(b) Verify that your answers to part a has the expected behavior as x

becomes very small and very large.

what i don't get is that the charge on y=0 can be anywhere on the x-axis so i don't know how to get the field on the x-axis when i can place that charge anywhere. can someone verify if this question is legit?