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Chapter 21A

# Chapter 21A - PH 2223 Announcements MasteringPhysics...

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5/13/09 11 PH 2223 Announcements MasteringPhysics Chapter 12-Assignment 1 due September 1. MasteringPhysics Chapter 12-Assignment 2 due September 3. First exam will cover Chapters 12 and 21. Possible dates for first exam are Thursday, September 4 or Tuesday, September 9. Date will be decided by vote in class on Thursday, August 28.

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5/13/09 PH 2223 Last lecture: Gravitational Force (Chapt. 12) Gravitational Potential Energy U and F for Arbitrary Bodies Electric Charge (Chapt. 21) Today (8/26/2008): Electric Force Electric Field Electric Field Lines 22
5/13/09 Electric Force The electric force between two point charges is given by Coulomb’s law: 33

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5/13/09 Units of Charge 1 Coulomb ( C ) = amount of charge that flows past a point in a wire during one second when the current in the wire is one ampere (amp or A). 1 e = 1.60217653 x 10-19 C 1 C equal to charge on 6.241509 x 1018 electrons. 1 C is big charge . Force on two 1 C charges 1 m apart is 8.99 x 109 N. 1 mC = 10-3 C 1 C = 10-6 C μ 1 nC = 10-9 C 44
5/13/09 Comparison: Electric and Gravitational Forces Both action-at-a-distance forces. Both inverse-square law forces. Both conservative forces. Equations have same form . Gravitational force is always attractive . Electric force can be attractive (attraction of unlike charges) OR repulsive (repulsion of 55

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5/13/09 Questio n Three point charges lie at the vertices of an equilateral triangle. All 3 charges have the same magnitude, but q1 and is positive and q2 and q3 are negative.
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Chapter 21A - PH 2223 Announcements MasteringPhysics...

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