Due Thursday: READ p 392-399, including p.397! p. 399#1-7. Two classes will have random quizzes over the reading as well, so please do read through - it will give you some good background for class discussions!
Today in class we warmed up with some algebra- exponent practice to help everyone with the homework problem due Tuesday, and then we got out electroscopes to experiment with charging by contact - see the 2nd part of the video below (it's a different type of electroscope than ours). Tonight's question is how you could get the electroscope to move without touching it (without actually transferring electrons onto or off of it) - everyone saw this happen in class - moving a charged object near you could make the electroscope "dance" but when you moved away, the foil leaves fell back to a neutral position, which would not have happened if you had changed the balance of charge in the electroscope. Finally, most classes got a chance to see the same phenomenon when holding a balloon near a stream of water - neutral water - so why did the water bend toward the balloon? The answer is a big topic we'll discuss tomorrow and the first part of this video: Charging by Induction.
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