# 110408 - Physics 122(composed by Steve Reich 1 Physics 122...

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Physics 122 4/8/11 Prof. E. F. Redish 1 4/8/11 1 Physics 122 (composed by Steve Reich) 4/14/10 11 Physics 122 Δ 1 2 mv 2 (29 = F || net Δ r = ± F net i Δ ± r = W net i i W U = Δ 4/8/11 13 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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Physics 122 4/8/11 Prof. E. F. Redish 2 4/8/11 15 Physics 122 Field of force felt by a positive test charge near a positive source. Electric Field felt by a positive test charge near a positive source. F = kqQ r 2 E = kQ r 2 4/8/11 17 Physics 122 Field of force felt by a negative test charge near a positive source. Electric Field felt by a negative test charge near a positive source. F = kqQ r 2 E = kQ r 2 4/14/10 18 Physics 122 q U V q F E = = ± ±
Physics 122 4/8/11 Prof. E. F. Redish

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110408 - Physics 122(composed by Steve Reich 1 Physics 122...

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