---Lou Gnecco <[email protected]> wrote:
>
> Do you get the same effect with the coins in a cloth bag or a paper
bag?
> Has anybody tried it?
> Lou
>
>
To answer that, there are two parts;
1) Look at the triboelectric series chart. This chart, shows, what
materials when rubbed with what other materials, will generate either
a positive or negative charge and the relative magnitude of the
charge. The materials at the top of the chart will generate a positive
charge and the materials at the bottom of the chart will generate a
negative charge. The farther apart the materials, the greater the
charge build up.
2) Determine the conductivity of both materials. If one of the
materials is a conductor, then assume that dishcharge can occur from
any location. If it is an insulator, then a dicharge can only occur
from the localized charged area. If one of the materials is a
conductor and the second material is poor conductor such as paper or
cloth, then the charge will begin decaying as soon as it is built up
with a time constant based on the conductivity of the poor conductor.
So, to answer your question, paper or cloth bags will have a lesser
effect than a polymer bag. In certain conditions, the charge may not
even built up enough to create any effects.
Hans Mellberg
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