Plastic is a generic term improperly used to indicate a large amount of carbon-based materials. If the "plastic" you are referring to is paramagnetic there is almost a negligible magnetic interaction. Therefore, you would need extremely high magnetic fields for such a material to feel an effect.

As plastic being a polymer, it is tightly packed, with the study of structure and packing of Plastics you can design.

The answer is "no".

If "works for plastic" is intended to mean "attracts plastic exclusively" then you would need a physical interaction that is specific to 'plastic'. I know of no such interaction.

The answer is yes, but not by electrostatic and I have over a 100 references.  Its done on the carbon surface by rearrangment of the lattice configuration.  Your looking at one right now