S09P1BLec15D

S09P1BLec15D - Physics 1B Lecture 15D "Shake this one,...

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Physics 1B Lecture 15D "Shake this one, that one shakes later. The sun atom shakes; my eye electron shakes eight minutes later because of a direct interaction across." --Richard Feynmann
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Administrativa Chapter 15 Solutions are up on-line. Problem Solving Sessions begin this Wednesday, 6pm - 8pm in 2623 Mayer Hall Addition.
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Electric Fields If a charge, q 2 , appears next a another charge, q 1 , it automatically feels an electric force (similar to gravity). We need a model to explain this fact (similar to g in gravity). This is where we get the idea of the electric ±eld. We have a source charge, q, which creates an electric ±eld. We also have a test charge, q o , which experiences a force due to the electric ±eld.
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Electric Fields This is a two-step process: Source charge q [Coul] E feld [N/Coul] Test charge q o [Coul] creates exerts ±orce on The electric feld can point in towards q OR away ±rom q (depending on the sign o± the source charge). The electric ±orce can point along the electric feld OR opposite the electric feld (depending on the sign o± the test charge).
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Electric Fields We relate the electric force and the electric ±eld by the following equation: This equation is always valid (not just for point
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S09P1BLec15D - Physics 1B Lecture 15D "Shake this one,...

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