110413 - Physics 122 4/13/11 4/13/11 Physics 122 1 4/13/11...

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Physics 122 4/13/11 Prof. E. F. Redish 1 4/13/11 1 Physics 122 4/13/11 2 Physics 122 4/13/11 3 Physics 122 8.1 8.2 8.3 a 2% a>c>b>d 4% a=b=c=d=e 41% b 80% a>c>b=d 15% a=b>c=d=e 4% c 7% b>a>d>c 6% c>a=b>d=e 16% d 1% b>d>a>c 8% d=e>a=b>c 15% e 10% b=d>a>c 6% a=b>c>d=e 4% f 0% c>a>b=d 12%
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Physics 122 4/13/11 Prof. E. F. Redish 2 4/13/11 4 Physics 122 Δ U E = ± F E ⋅Δ ± r (small step) Δ U E = ± F E ± r () (lots of little steps) Δ U E = ± F E d ± r start finish General case Simplest case (one source charge, one test charge) Δ U E = ± F E d ± r start finish = k C qQ r 2 dr r i r f = k C qQ dr r 2 r i r f = k C qQ 1 r i 1 r f U E ( r ) = k C qQ r NOT A VECTOR – JUST A NUMBER
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110413 - Physics 122 4/13/11 4/13/11 Physics 122 1 4/13/11...

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