The body is held on the table by the charge q. To the right of it, at a distance
l, a point charge of the same name q is attached. On the left, at the same
distance, rests a bar of mass M, which has a coefficient of friction µ with the
table. The body is released, and it begins to slide without friction on the table,
elastically hitting the bar, without transferring its charge to it when hitting
it. How far will the bar move as a result of all body impacts?
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8 Electric Current
8.1 Current. Current density. Current in vacuum