It depends on your environment.
for example, one internal area may have 34 % neutral (uncharged) 33 % positive 33 % negative surface area.
When two materials contact and separate, the polarity and magnitude of the charge are indicated by the materials’ positions in a triboelectric series. The triboelectric series tables show how charges are generated on various materials. When two materials contact and separate, the one nearer the top of the series takes on a positive charge, the other a negative charge. Materials further apart on the table typically generate a higher charge than ones closer together. These tables, however, should only be used as a general guide because there are many variables involved that cannot be controlled well enough to ensure repeatability. A typical triboelectric series is shown in below table.
Virtually all materials, including water and dirt particles in the air, can be triboelectrically charged. How much charge is generated, where that charge goes, and how quickly, are functions of the materials’ physical, chemical and electrical characteristics.
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