I need some help with this problem. I have done some of the question but
I it seems to be wrong. any help is greatly appreciated.

E1. A positive charge +q is located on the postive x-axis
at x = +a. A negative charge -q is located on the
negative x-axis at x = -a.
(a) Find a general expression for the total electric
field strength at all points on the x-axis to the
right of x = +a. Show that your expression is
equivalent to 4akqx/((x^2-a^2)^2).
(b) Show how to use the binomial expansion to find
an approximate expression for the same field
strength which is valid for x >> +a. Show two
terms in your expression. Why is it often
said that the field of a dipole, far from the
dipole, "goes like" 1/(r^3)?


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