# Lecture02bd - Physics 102: Lecture 02 Coulomb's Law and...

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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

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Physics 102: Lecture 2, Slide 2 Coulomb Law practice: Three Charges Q=-7.0 m C Q=+2.0 m C 6 m 4 m Calculate force on +2 m C charge due to other two charges – Draw forces – Calculate force from +7 m C charge – Calculate force from –7 m C charge – Add (VECTORS!) F +7 Q=+7.0 m C F -7
Physics 102: Lecture 2, Slide 3 Three Charges – Calculate forces Q=-7.0 m C Q=+2.0 m C 6 m 4 m Calculate force on +2 m C charge due to other two charges – Draw forces – Calculate force from +7 m C charge – Calculate force from –7 m C charge – Add (VECTORS!) Calculate magnitudes F +7 Q=+7.0 m C F -7 ? = ° ? 1 ? 2 ± 2 ? +7 = 9 × ²0 ³ ´ × ²0 −6 |µ × ²0 −6 | 5 2 ? −7 = 9 × ²0 ³ ´ × ²0 −6 | ¶ µ × ²0 −6 | 5 2 = 5 × ²0 −3 ·

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Physics 102: Lecture 2, Slide 4 Q=-7.0 m C Q=+2.0 m C 6 m 4 m F +7 Q=+7.0 m C F -7 Three charges – Adding Vectors F +7 +F -7 Calculate components of vectors F +7 and F -7 : ? +7,? = ? +7 cos ° = 5 × 10 −3 ± ² 5 ? +7,³ = ? +7 sin ° = 5 × 10 −3 ± 4 5 ? −7,? = ? −7 cos ° = 5 × 10 −3 ± ² 5 ? −7,³ = ´? −7 sin ° = ´5 × 10 −3 ± 4 5
Physics 102: Lecture 2, Slide 5 Q=-7.0 m C Q=+2.0 m C 6 m 4 m F +7 Q=+7.0 m C F -7 Three charges – Adding Vectors F +7 +F -7 Add like components of vectors F +7 and F -7 : F Final vector F has magnitude and direction

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## This note was uploaded on 02/04/2012 for the course PHYSICS 102 taught by Professor Demarco during the Spring '11 term at University of Illinois at Urbana–Champaign.

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Lecture02bd - Physics 102: Lecture 02 Coulomb's Law and...

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