During experiments measuring the tribo-electrification of spherical particles rolling down an inclined plane, it was noted that total charge on the particles and sometimes the sign of the charge varied as the number of particles increased. An equilibrium value of Q/m for the particles was reached fairly quickly as the number of particles was incremented. This suggests that particle - particle triboelectric interactions and/or plane charge saturation tend to dominate the overall triboelectric interaction over particle - plane interactions for more than a relatively few numbers of particles.
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