Lecture04

Lecture04 - Lecture 4 Chapter 15. Matter & Electric...

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1 Lecture 4 Chapter 15. Matter & Electric Fields * Conductors and Insulators * Charging and Discharging * When the Field Concept is Less than Useful r r q E ˆ 4 1 2 1 0 1 πε = r r q p ˆ 4 1 2 1 0 α = r r q E ˆ 2 4 1 5 1 2 0 2 = r r q F ˆ 2 4 1 5 2 1 2 0 1 = 1) 2) 3) 4) r r q F ˆ 2 4 1 5 2 1 2 0 2 = 5) Neutral atoms are attracted by charges! Interaction strength ~ 1/r 5 Summary: A Neutral Atom and a Point Charge q 1 q 2 Interaction of like-charged Objects Summary: Interaction of Charged Objects Attraction: can happen also for like-charged objects! Repulsion: can happen only for like-charged objects! r r q N r q q F ˆ 2 4 1 4 1 5 2 1 2 0 2 2 1 0 = Intervening matter does not “block” the E field The resulting field is a superposition of two fields: Field of the other charge plus the field of induced dipoles.
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Lecture04 - Lecture 4 Chapter 15. Matter & Electric...

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