Q: An electrified rod attracts pieces of paper. After a while, these pieces fly away! Why?
Ans: An electrified rod may attract pieces of paper, but after a while, these pieces will fly away because the rod has lost its charge. When a rod is electrified, it becomes charged with either a positive or negative charge. Opposite charges attract each other, so if the rod is charged with a positive charge, it will attract negative charges. Similarly, if the rod is charged with a negative charge, it will attract positive charges.
The pieces of paper may become charged as they come into contact with the electrified rod, either by transferring electrons from the rod to the paper or by receiving electrons from the rod. This causes the paper to become charged with the opposite charge of the rod. The charged paper is then attracted to the rod due to the opposite charges.
However, after a while, the charges on the rod and the paper may become neutralized through a process called discharge. This can occur through various mechanisms, such as the transfer of electrons from the rod to the paper, the transfer of electrons from the paper to the rod, or the transfer of electrons from the rod and the paper to a nearby object or the ground. Once the charges on the rod and the paper are neutralized, there is no longer any attractive force between them, and the paper flies away.
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