Force on insulated wire at the interface of two dielectric media

The electric field is calculated and the forces are evaluated for the system consisting of an infinitely long charged filamentary conductor located parallel to the plane boundary surface between two dielectric media. The straight filamentary wire is surrounded by a cylindrical insulator. It is established that the direction of the force acting on the charged wire is determined only by a difference in value between the permittivities of the two media and does not depend on the permittivity of the insulation of the wire. The solution of the problem is derived in an analytical form that shows directly the influence of the dielectric materials on the distribution of the electric field and on the values of the forces in the examined system