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2 electricForceDetails

2 electricForceDetails - Craig Ogilvie Logistics Clicker...

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Unformatted text preview: Craig Ogilvie Logistics § Clicker extra credit points start today – Register clicker ID on BB home page § Weekly summary (extra credit) – Via BlackBoard enter your summary of the main ideas » By Sat 8am – Provide anonymous feedback to 2 other summaries » By Tue 8am Craig Ogilvie 11 Craig Ogilvie Craig Ogilvie 22 Review Lecture 1 § Two charge states, conventionally labeled +ve, -ve § Quantify force, action-at-distance, 1st 222 lab § Processes can only separate charge – charge is conserved ++ ++ r r r q q F ˆ 4 1 2 2 1 πε = Force direction on the line between two charges Craig Ogilvie Question: Demo § Charge a pith ball, with either +ve or –ve charge § It is attracted to a large, uncharged object – Why? Write an answer down yourself – Share your answer with a neighbor § Charges in material can slightly shift – Polarizability § Pith ball attracted to negative, displaced charges Craig Ogilvie 33 ++ ++- +- +- +- + Craig Ogilvie Goals § Application of charge mobility – Introduction to mobility (conductors, insulators) in pre-lecture video § Problem-solving with Coulomb’s Law § Introduction to electric field Craig Ogilvie 44 Craig Ogilvie Application of Mobility: charging by induction 1. Charge insulating plate 2. Bring metal disk close – Mobile charges move 3. Provide path for charges on top of plate to go to ground 4. Remove metal disk 5. No change to insulating plate Craig Ogilvie 55 O bj1 0 1 Craig Ogilvie...
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2 electricForceDetails - Craig Ogilvie Logistics Clicker...

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