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Lectures_Lect02

Lectures_Lect02 - Physics 212 Lecture 2 Slide Physics 212...

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Unformatted text preview: Physics 212 Lecture 2, Slide Physics 212 Lecture 2, Slide 1 Physics 212 Physics 212 Lecture 2 Lecture 2 Today's Concept: Today's Concept: The Electric Field The Electric Field Continuous Charge Distributions Continuous Charge Distributions Physics 212 Lecture 2, Slide Physics 212 Lecture 2, Slide 2 33 33 q q 1 q q 2 q q 3 q q 4 F F 2,1 2,1 F F 3,1 3,1 F F 4,1 4,1 F F 1 F F 2,1 2,1 F F 3,1 3,1 F F 4,1 4,1 F F 1 F F 2,1 2,1 F F 3,1 3,1 F F 4,1 4,1 F F 1 F F 2,1 2,1 F F 3,1 3,1 F F 4,1 4,1 F F 1 q q 1 q q 2 q q 3 q q 4 Coulomb’s Law (from last time) Coulomb’s Law (from last time) If there are more than two charges present, the total force on any given charge is If there are more than two charges present, the total force on any given charge is just the just the vector sum vector sum of the forces due to each of the other charges: of the forces due to each of the other charges: +q 1 -> -q 1 direction reversed 1 F MATH: MATH: 1 3 1 2 1 4 12 13 14 2 2 2 12 13 14 ˆ ˆ ˆ = + + kq q kq q kq q r r r r r r 3 1 2 4 12 13 14 2 2 2 1 12 13 14 ˆ ˆ ˆ = + + kq F kq kq r r r q r r r 1 E v Physics 212 Lecture 2, Slide Physics 212 Lecture 2, Slide 3 Electric Field The electric field E at a point in space is simply the force per unit charge at that point. Electric field due to a point charged particle Superposition q q 2 q q 3 q q 4 E 2 E 3 E 4 E 08 F E q ≡ 2 ˆ Q E k r r = 2 ˆ i i i i Q E k r r = ∑ Field points toward negative and Field points toward negative and Away from positive charges. Away from positive charges. B? 4) Physics 212 Lecture 2, Slide Physics 212 Lecture 2, Slide 4 simulation simulation 09 Checkpoint “I don't completely understand how to determine the direction of the electric field.” I don't completely understand how to determine the direction of the electric field.” Physics 212 Lecture 2, Slide Physics 212 Lecture 2, Slide 5 12 Checkpoint E E Physics 212 Lecture 2, Slide Physics 212 Lecture 2, Slide 6 Two Charges Two Charges Two charges q 1 and...
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