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# lect02_handout - Physics 102 Lecture 02 Coulombs 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 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 10 11 12 F +7 Q=+7.0 μ C F -7

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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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lect02_handout - Physics 102 Lecture 02 Coulombs Law and...

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