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Lecture03

# Lecture03 - Physics 132 Introductory Physics Electricity...

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1 January 9, 2008 Physics 132-Winter 2008 Prof. Jim Beatty-Ohio State 1 Physics 132 Introductory Physics: Electricity and Magnetism Winter Quarter 2008 Lecture 3 January 9, 2008 Physics 132-Winter 2008 Prof. Jim Beatty-Ohio State 2 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”

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2 January 9, 2008 Physics 132-Winter 2008 Prof. Jim Beatty-Ohio State 3 A Special Case Q q R A uniformly charged spherical shell with total charge Q is particularly simple. Q q R Outside: same force as point charge Q placed at its center. Inside: no net force F=0 January 9, 2008 Physics 132-Winter 2008 Prof. Jim Beatty-Ohio State 4 Principle of Superposition To calculate the force due to many charges acting on a point charge, just add up the force vectors due to each piece of charge, each calculated from Coulomb’s Law. Electromagnetism is linear . Can add numerically, do an explicit integral, or use symmetries to make the calculation easier
3 January 9, 2008 Physics 132-Winter 2008 Prof. Jim Beatty-Ohio State 5 Coulomb’s Law: Adding Forces Three equal charges form an equilateral triangle.

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Lecture03 - Physics 132 Introductory Physics Electricity...

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