Posted by P on .
A chargeQ is located at x=l/2 and a charge +Q is located at x=l/2 . Thus the separation between the two charges is l .
The total electric field on the x axis can be written as
E(x)=E(x)d^
(a) What is the direction d^ of the total electric field at any point on the x axis where x>l/2 ?
(b)What is E(X) as a function of x for x>l/2? Express your answer in terms of, if necessary, Q ,l , x and the constant epsilon_0 (if needed, enter pi for π , epsilon_0 for epsilon_0 ).
unanswered
(c) Consider now the limit where x>>l , so that
(1±l/2x)^2~1干l/x
Express, in this limit,E(x) in terms of, if necessary, p , x and epsilon_0 . The quantity P=Ql is called the dipole moment.

Physics 
Anonymous,
Please give answer.