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Homework Statement
An electric dipole of moment p is placed at a distance r from a point charge +q. The angle between p and r is phi. Show that the energy of interaction between the dipole and the charge is -pqcos(phi)/4[tex]\pi[/tex][tex]\epsilon[/tex]0r^2
Derive equations for
a)a radial force on the dipole
b)a force on the dipole normal to r
c)a couple on the dipole
Homework Equations
The Attempt at a Solution
I have proved the first part of the question using the integral of the torque between [tex]\phi[/tex]0 and [tex]\varphi[/tex] and setting [tex]\varphi[/tex]0 to 90degrees and I believe that questions a, b and c are simple manipulations of the proved equation, but no book I read will give me a proof or an explanation of the 'radial force' and how to prove questions a, b and c could anyone help?