Lecture%202%202220%20Spring%202009

Lecture%202%202220%20Spring%202009 - Physics 2220...

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1 Physics 2220 Announcements: HW 1 is posted, and is due Tuesday at 7 pm; HW 2 will be posted by tomorrow, and will be due next Friday at 7 pm. Help room (Physics 117) is open from 2 to 6 today. The full schedule will be made available on Monday. All recitations will meet next week. Labs start next week. Plan on going live with clickers on Monday. Electric Charges • Two kinds - positive and negative • Electric charge is always conserved in an isolated system • The electric charge, q , is quantized Types of materials • Conductors • Insulators Semiconductor • Semiconductors Charging by Induction Charge Rearrangement in Insulators • A process similar to induction can take place in insulators • The charges within the molecules of the material are rearranged An electrically neutral object in the presence of a point charge will 33% 33% 33% 1. be attracted to charge 2. be repelled by the charge 0 of 140 123 3. experience no net force
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2 Why?
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This document was uploaded on 09/30/2009.

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Lecture%202%202220%20Spring%202009 - Physics 2220...

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