Take a sheet of paper, press it against the wall and release it. It can be seen that it instantly falls.

Take a sheet of paper, press it against the wall and release it. It can be seen that it instantly falls. But if the sheet pressed against the wall is rubbed with a woolen cloth, then it will hold out on the wall for a while, like glued. How can this phenomenon be explained?

The observed phenomenon is explained very simply. When you start rubbing the bodies against each other, then later you observe the process of electrification. The electrification process is realized due to the fact that electrons, when interacting between objects, pass from one body to another. But, what is important, new charges do not appear as a result of interaction, but are redistributed. Because of this, the bodies acquire a charge of the opposite sign and begin to attract each other. It should also be remembered that, since the law of conservation of electric charge is fulfilled, the number of particles participating in the process does not change.