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Observation: and conclusion:
1-The leaves of the electroscope do not diverge

so the tested object is not charged
2- The leaves of the electroscope diverge (spread)

Then the tested object is charged.

Charging by Contact: The process of charging an uncharged

object by its contact with a charged object.

2- To determine the type of the charge on a charged object:
Procedures:
(1) Charge the electroscope with a certain electric charge, for example, a
positive charge.
(2) Bring the charge of the tested object close to the electroscope disc
without touching it.

First Term 111