To communicate to the electrometer as much charge as possible, it is necessary not only to touch the electrometer rod with

To communicate to the electrometer as much charge as possible, it is necessary not only to touch the electrometer rod with a charged rod, but also to hold the rod over it several times, rotating it around the longitudinal axis. Why?

The charges do not move along the dielectric daddy, so it is necessary to increase the contact area of the stick with the previous electrometer.

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