Then we read pages 389-392 in the textbook and took notes on:
- charging by contact
- charging by induction
- ground/grounding
- charge polarization/electrically polarized
- what's special about water?
- Why does a charged balloon stick to a wall?
You could have also worked on your homeworks as you read: Electrostatics II and Electrostatics III.
We then saw some demonstrations about stuff in your reading:
- A balloon attracting polar water molecules. A great video explanation (that I did not make) is here. You can do the same thing at home with a faucet turned very low and a plastic comb you have run through dry hair a few times.
- A charged balloon attracts and then repels paper pieces
- Students acting like electrons are repelled by a negatively charged balloon or attracted by positively charged candy to induce a charge on one side of the room.
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