I would like to compile a short list of inverse-exponent force magnitude fall-off laws for several simple geometries for material made of monopoles and for material made of parallel dipoles (of negligible length). Far field force for any two objects is, of course, proportional to [itex]1/r^2[/itex] for monopole-based objects, and [itex]1/r^4[/itex] for dipole-based objects (yes, field for dipoles drops with [itex]1/r^3[/itex], but i'm interested in force between two objects that are both made of dipoles. The definition for field strength is related to the force on a monopole). So what is the force magnitude fall-off (both monopole and dipole material) for the following near-field geometries?: a point near a line a line near a parallel line a line near a perpendicular line (Side note: the field above a plane made of dipoles is uniform, so there will be zero force (except torque) on dipoles above it) Thanks.