A glass rod, rubbed against silk, is brought to the ball of a charged electroscope, but does not touch it. The electroscope

A glass rod, rubbed against silk, is brought to the ball of a charged electroscope, but does not touch it. The electroscope leaves move closer together. What is the sign of the electroscope charge?

Since the leaves of the electroscope come closer, and then come closer, then the charge of the glass rod and the charge of the electroscope are different. A glass rod that is worn against silk acquires a positive charge. So the electroscope charge is positive.
Answer: + (positive).



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