8. Physics 102: Lecture 1, Slide Electric charge & Coulomb’s Law Physics 102: Lecture 01
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10. Conductors and Insulators Physics 102: Lecture 1, Slide Most things are in between perfect conductor / insulator Q: How do electrons behave in a perfect conductor? Q: How do electrons behave in a perfect insulator?
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17. Physics 102: Lecture 1, Slide Electric dipole A positive and negative charge of equal magnitude separated by a (usually small) distance + – – Q +Q Ex: water = = H O + + - H
18. ACT Physics 102: Lecture 1, Slide + - – An electric dipole is placed near a large negative charge. What is the net force on the two connected charges? A) Left B) Zero C) Right
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Editor's Notes
Go over Daily Planner, Course Description, Lectures
Lectures M,W HW due 8 AM Tuesday the following week Disc Tues-Fri, the week following the lecture Quiz: due two days after Disc
Key to doing well is keeping up with the volume of work. Stuff comes very fast in this course. Lots of new concepts. You need to work hard and often to keep up.
There’s a rumor that physics 102 is harder than physics 101…..
Start by asking if electric force is so large, why don’t we ever feel it? Copper and wood both made of atoms, both have positive and negative charges, but are electrically very different. Why?
Copper and wood both made of atoms, both have positive and negative charges, but are electrically very different. Why?
Do the demo first, then show the visualization. Comment on how electroscope works. It’s like VandeGraaff and hair standing on end.
Do the demo first, then show the visualization. Comment on how electroscope works. It’s like VandeGraaff and hair standing on end.
Magnitude – take absolute value sign for charges, only positive sign
Calculate force on electron due to proton
Dipole of water is permanent
This is why water is attracted to ions & why it aligns with respect to ions (depending on charge).
Explains why non-polar molecules will also be attracted to ions via induced dipole
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