August 12 2013 29 more useful quantity

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Unformatted text preview: which is at ri, the voltage at r is: ei i i   For a collection of charges, the total voltage is the sum of the parts: kq V (r ) = r −r ke qi V (r ) = ∑ i r −r i Physics 2B - Summer Session 2 - C. Palmer August 12, 2013 33   Electric potential energy difference ΔU = − ∫ final initial final F ⋅ ds = − q0 ∫ E ⋅ ds initial   Electric potential difference final ΔU ΔV = = −∫ E ⋅ ds initial q0   For conservative forces (like electromagnetic forces) these integrals are independent of the path taken/chosen. Physics 2B - Summer Session 2 - C. Palmer August 12, 2013 34...
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