RCW03 solutions.pdf - Recitation ClassWork 3 solutions Physics 194 1 ALG 16.1.1 Initially the tube the wool and the electroscope are all at zero

RCW03 solutions.pdf - Recitation ClassWork 3 solutions...

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Recitation ClassWork 3 solutions Physics 194 1. ALG 16.1.1 Initially the tube, the wool, and the electroscope are all at zero electric potential. When the tube is rubbed it becomes positively charged (let’s assume) which means its electric potential is above zero. When the tube touches the electroscope, electrons transfer from the electroscope to the tube because electrons tend to travel towards places of higher electric potential. This leaves the electroscope positive, so the needle deflects. The positively charged electroscope is at a higher electric potential than the neutral one. When they are connected electrons travel from the neutral to the positive one (towards higher electric potential). This makes the first electroscope less positively charged (so its needle deflects less) and the second electroscope more positively charged (so its needle deflects more). When the tube is rubbed again it returns to its original positive electric potential (higher than both electroscopes now that they have been connected). This means electrons will travel from both electroscopes to the tube making them both more positive so their needles will deflect more.
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