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I had this question in my homework:

An electric dipole consists of two equal loads and signs opposite separated by one distance which equals 2a. Show how the module of the electric force resulting on a proton (load +e) placed directly on the Y=axis at a very long distance from the dipole (y>>a) is given by Fe = 2aekq/y^3

The usual equation for the electric force is: Fe= keq/r^2

I tried to replace the distance r^2 with Pythagore: a^2 + y^2 = r^2, but i didnt find the y^3

Could anybody help me?