Dielectrophoresis occurs because of the interaction between the induced dipole and the electric field. The interaction creates a net force, which depends on both the gradient of the electric field and electrical properties (permittivity and conductivity) of the particle and the media. The net force applies on partices, charged or not, and drives them to move. This technique can be used in the analysis, manipulation, and separation of cellular scale and nanometer scale particles like cells, DNA etc.