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HW1Solutions - SOLUTIONS HW1 Q21-4 Atoms and molecules in...

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SOLUTIONS – HW1 Q21-4) Atoms and molecules in the paper are polarized: The electrons are pulled towards the rod, the nuclei (protons + neutrons) remain essentially where they are. In other words: the electron clouds are deformed. This makes the pieces of paper “more negative” on the side closer to the rod, and “more positive” on the opposite side. Q21-5) When rubbing the plastic ruler with a cloth, electrons are transferred from the cloth to the ruler, thus charging it negatively. Attraction occurs just as in Q21-4), only this time the electrons in the pieces of paper are repelled by the ruler and move away from it, thus leaving the positively charged nuclei closer to the ruler. On a humid day the air contains many water molecules. Water is polar, i.e. the charge on a water molecule is not uniformly distributed. Electrons on the ruler can be attracted to water molecules in the air and “leak off”, thus slowly de-charging the rod. Q21-13) Sometimes electrons from the ruler can jump onto the piece of paper, as they are attracted to the polarized molecules in the paper. As the paper was initially
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