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12.9: Key Applications

Difficulty Level: At Grade Created by: CK-12
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  • In problems that ask for excess negative or positive charge, remember that each electron has one unit of the fundamental charge \begin{align*} e = 1.6 \times 10^{-19} \text{C}\end{align*}e=1.6×1019C.
  • To find the speed of a particle after it traverses a voltage difference, use the equation for the conservation of energy: \begin{align*} q \Delta V = \tfrac{1}{2} m v^2 \end{align*}qΔV=12mv2
  • Force and electric field are vectors. Use your vector math skills (i.e. keep the x and y directions separate) when solving two-dimensional problems.

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CK.SCI.ENG.SE.2.Peoples-Physics.13.9
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