CBSE Class 12-science Answered
Expert Answer
The transfer of charge depends on the two materials. Materials can be ranked according to their tendency to gain or loose electrons in a triboelectric series. So you can see that glass would tend to acquire a more positive charge than silk, which means that electrons would go from glass to silk.
The following table has been picked from
http://www.siliconfareast.com/tribo_series.htm
Table 1. The Triboelectric Series
|
Most Positive (+) |
|
|
Air |
+++
+ |
|
Human Hands, Skin |
|
|
Asbestos |
|
|
Rabbit Fur |
|
|
Glass |
|
|
Human Hair |
|
|
Mica |
|
|
Nylon |
|
|
Wool |
|
|
Lead |
|
|
Cat Fur |
|
|
Silk |
|
|
Aluminum |
|
|
Paper |
|
|
Cotton |
|
|
Steel |
-
- - - |
|
Wood |
|
|
Lucite |
|
|
Sealing Wax |
|
|
Amber |
|
|
Rubber Balloon |
|
|
Hard Rubber |
|
|
Mylar |
|
|
Nickel |
|
|
Copper |
|
|
Silver |
|
|
uv Resist |
|
|
Brass |
|
|
Synthetic Rubber |
|
|
Gold, Platinum |
|
|
Sulfur |
|
|
Acetate, Rayon |
|
|
Polyester |
|
|
Celluloid |
|
|
Polystyrene |
|
|
Orlon, Acrylic |
|
|
Cellophane Tape |
|
|
Polyvinylidene chloride (Saran) |
|
|
Polyurethane |
|
|
Polyethylene |
|
|
Polypropylene |
|
|
Polyvinylchloride (Vinyl) |
|
|
Kel-F (PCTFE) |
|
|
Silicon |
|
|
Teflon |
|
|
Silicone Rubber |
|
|
Most Negative (-) |
|
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