# pp23 - PHYSICS A World View Thursday 14 April 2005 READ Ch...

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PHYSICS: A World View Thursday, 14 April 2005 READ Ch 21 (p 436 - 443) PRAC Ch 20: Q 31, 41, 49, 53; E 17, 21 HW #23 Ch 20: Q 34, 40, 44; E 8 Tu 19 Apr LAB #20 Batteries and Bulbs I No Prelab

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Remember: Quiz on Tuesday Covers Chapters 16 and 20
Check Question: If you remove one electron from a quarter and one electron from a Buick, which (if either) has the greater net charge?

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The Electric Force  Has the same form as gravity 1 2 2 QQ F k r = Q Q measured in coulombs (C) measured in coulombs (C) k k = 9 = 9 × × 10 10 9 N m 2 /C 2 Coulomb’s constant Coulomb’s constant
The Electric Force  A coulomb is a tremendously large charge 1 2 2 QQ F k r = ( 29 ( 29 ( 29 2 9 2 2 1 C 1 C N m 9 10 C 1 m × = × ÷ 9 9 10 N = × This is a force of 1 million tons! This is a force of 1 million tons!

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Electric Force  Electric force is very strong Why does gravity dominate at large Why does gravity dominate at large scales? scales?
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## This document was uploaded on 10/29/2011 for the course PHSX 103 at MSU Bozeman.

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pp23 - PHYSICS A World View Thursday 14 April 2005 READ Ch...

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