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[A dielectric particle]
would pick up an induced dipole in proportion to the
electric field _gradient_ and would therefore go to the
_edges_ of the image on the drum. The result would be a
weird silhouette.
This is not entirely hypothetical; there is always some
uncharged toner floating around, and it is a well-known
imperfection of old and/or broken copiers that they tend
to exaggerate edges in the image, making copies look
"sharper" than the original.