content_image/361954.jpg
<img src='content_image/361954.jpg'>

small h , this dipole active eigenmode approaches 1/2 as the junction becomes tighter. Thus, according to equations (27) and (28) the effect of χ$_{2}$ is “enhanced” due to the presence of a nonconductive shell (as the case for biological particles analyzed in [3, 25]). Moreover, the decrease of P$_{2}$$_{,}$$_{1}$ is compensated by the increase of 1 / (1 / 2 − χ$_{2}$ ). 

The presence of a new relaxation at low frequency along with its relationship with the size of h has been already singled out in Gheorghiu et al. [25] by using the same method but without the analysis of dipole-active eigenmodes. Using a finite discrete model [3], the relaxation was observed before the segregation during cell division, while other papers [34, 35] fail to relate the size of h to the new relaxation, even though one of them [34] employs essentially the same method as the one outlined in the present work. 

Figure 3 shows the charge distribution associated with the first four eigenvalues for two distinct values of h . The second eigenmode is an antisymmetric combination of net charge distributions (monopoles) on each particle of the dimer. The third charge distribution is an antisymmetric combination of charge distributions with a dipole moment on each part of the 

