Electric dipole

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Homework Statement


Consider the electric dipole shown in Figure P23.22. Show that the electric field at a distant point on the +x axis is Ex ≈ 4ke qa/x3.

I tried to get a picture but that didn't work out but it basically shows a positive and a negative charge on the x-axis with a distance of 2a between them.

Not sure how to do this one, it has something to do with finding the x and y components correct?



Homework Equations



E=kq/r^2= k q/(a^2+y^2)

The Attempt at a Solution



Not sure how to do this one, does it has something to do with using the above equations then finding the x and y components? if not I have no clue where to start.
 

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