lect02_handout - Physics 102: Lecture 2, Slide 1...

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Unformatted text preview: Physics 102: Lecture 2, Slide 1 Coulomb’s Law and Electric Fields Physics 102: Lecture 02 Today we will … • get some practice using Coulomb’s Law • learn the concept of an Electric Field Physics 102: Lecture 2, Slide 2 Recall Coulomb’s Law • Magnitude of the force between charges q 1 and q 2 separated a distance r: F = k q 1 q 2 /r 2 k = 9x10 9 Nm 2 /C 2 • Force is – attractive if q 1 and q 2 have opposite sign – repulsive if q 1 and q 2 have same sign • Units: – q’s have units of Coulombs (C) • charge on proton is 1.6 x 10-19 C – r has units of m – F has units of N Physics 102: Lecture 2, Slide 3 Coulomb Law practice: Three Charges Q=-7.0 μ C Q=+2.0 μ C 6 m 4 m • Calculate force on +2 μ C charge due to other two charges – Draw forces – Calculate force from +7 μ C charge – Calculate force from –7 μ C charge – Add (VECTORS!) 1 2 3 4 5 6 7 8 9 1 1 1 1 2 F +7 Q=+7.0 μ C F-7 Physics 102: Lecture 2, Slide 4 Three Charges – Calculate forces Q=-7.0 μ C Q=+2.0 μ C 6 m 4 m • Calculate force on +2 μ C charge due to other two charges – Draw forces – Calculate force from +7 μ C charge – Calculate force from –7 μ C charge – Add (VECTORS!) • Calculate magnitudes F +7 Q=+7.0 μ C F-7 ? = ?...
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This note was uploaded on 02/22/2012 for the course PHYSICS 102 taught by Professor Demarco during the Spring '12 term at University of Illinois, Urbana Champaign.

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lect02_handout - Physics 102: Lecture 2, Slide 1...

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