(Answered) Field from two charges 1 e asymp 1

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Field from two charges **
1 + E ≈ 1 - E/2 + 3E2/8.

A charge 2q is at the origin, and a charge -q is at x = a on the x axis.

(a) Find the point on the x axis where the electric field is zero.

(b) Consider the vertical line passing through the charge -q, that is, the line given by x = a. Locate, at least approximately, a point on this line where the electric field is parallel to the x axis.

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