Let circles C1    and C2   on Argand plane be given by  z+1=3 and  z-2=7  respectively. If a variable circle C be such that   it touches C1   externally and C2   internally .The  locus of  center of  variable circle describes a conic E. If eccentricity of E can be written in simplest from and p/q when p, q   then find the value of |q – p|