Electrify the ruler by rubbing it with a cloth. Cut small pieces of paper and examine how the ruler acts on them.

Electrify the ruler by rubbing it with a cloth. Cut small pieces of paper and examine how the ruler acts on them. After a while, bring the ruler back to the pieces of paper. Is there any charge on the ruler? Explain your observations.

If, immediately after electrification, the ruler is brought up to small pieces of paper, they will be attracted to it. If you repeat the experiment after a while, then the pieces of paper will no longer be attracted, the charge on the ruler will go through the person’s hand into the ground.

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.