LECT2_153155

LECT2_153155 - Electric Force +e +e +e +e +4e A collection...

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Electric Force k e q 1 q 2 Coulomb’s Law: F e = r 2 Given two objects with charges q 1 2 : Coulomb constant k e = 8.9875 x 10 9 N m 2 / C 2 +e +e +e +e +4e …equivalent to “a charge” with +4e A collection of 4 charges, each with +1e…
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Superposition Use superposition (vector addition) to find net force! +q1 +q2 +q3 F net = F 12 + F 23
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Superposition Example of superposition: One e surrounded by a hexagon of protons, all held fixed: What’s the net electrostatic force on the e ? +1e +1e +1e +1e +1e +1e -1e F 1 F 6 F 5 F 4 F 3 F 2
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Superposition Example of superposition: One e surrounded by a hexagon of protons, all held fixed: What’s the net electrostatic force on the e ? +1e +1e F 1 + F 4 = 0 F 2 + F 5 = 0 F 3 + F 6 = 0 Total F = 0! +1e +1e +1e +1e -1e F 1 F 6 F 5 F 4 F 3 F 2
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You have two charges (+4e and -1e) in a line, separated by distance r 0 . Where along the line is the net force on a charge of +1e zero? +4e
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This note was uploaded on 09/30/2011 for the course PHYS 1B taught by Professor Briankeating during the Summer '07 term at UCSD.

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LECT2_153155 - Electric Force +e +e +e +e +4e A collection...

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