Lecture02

# Lecture02 - Physics 132 Introductory Physics Electricity...

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1 January 7, 2008 Physics 132-Winter 2008 Prof. Jim Beatty-Ohio State 1 Physics 132 Introductory Physics: Electricity and Magnetism Winter Quarter 2008 Lecture 2 January 7, 2008 Physics 132-Winter 2008 Prof. Jim Beatty-Ohio State 2 Last Time • Two kinds of charges – Like charges repel – Unlike charges attract – Net charge is conserved and quantized • Charge can be transferred between objects. • In a conductor, electrons are free to move, so charge can be induced.

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2 January 7, 2008 Physics 132-Winter 2008 Prof. Jim Beatty-Ohio State 3 Forces Between Two Point Charges - + q 1 q 2 F 2on1 F 1on2 + - q 1 q 2 F 2on1 F 1on2 + + q 1 q 2 F 2on1 F 1on2 - - q 1 q 2 F 2on1 F 1on2 Newton’s Third Law: F 2on1 = -F 1on2 Unlike charges attract; like charges repel. Forces must be along the line connecting the two charges. January 7, 2008 Physics 132-Winter 2008 Prof. Jim Beatty-Ohio State 4 Coulomb’s Law Force between two point charges is: along the line connecting them Proportional to magnitude of each charge Inversely proportional to the square of the separation Unlike charges repel, like charges attract. These forces are vectors, just like any other force! F 1 on 2 = F 2 on 1 = k q 1 q 2 r 12 2
3 January 7, 2008 Physics 132-Winter 2008 Prof. Jim Beatty-Ohio State 5 Coulomb’s Law F 12 = kq 1 q 2 r 12 2 k = 8.99 × 10 9 Nm 2 C 2 = 1 4 πε 0 ε 0 = 8.85 × 10 12 2 2 12 = 1 4 0 1 2 12 2 k: “electrostatic constant” ε 0: “Permittivity of free space” January 7, 2008 Physics 132-Winter 2008 Prof. Jim Beatty-Ohio State 6 Units • Unit of charge is the Coulomb • Fundamental unit of charge e = 1.6x10 -19 Coulombs • All charges in Nature seem to be multiples of e!

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Lecture02 - Physics 132 Introductory Physics Electricity...

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