How do you determine kinetic energy?

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How do you determine kinetic energy?

Two equal point charges Q are separated by a distance of d. One of the charges released and moves away from the other due only to the electrical force between them. When the moving charge is a distance 3d away from the other charge, what is the kinetic energy?

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Answer 1 · 2018-01-11T17:01:13

Initial potential energy of each of the charge is $E p 1 = (\frac{1}{K}) (\frac{Q^{2}}{d})$ $Ep1=(1/K)(Q^2/d)$
When one of them is at a distance 3d from the other,its potential energy is $E p 2 = (\frac{1}{K}) (\frac{Q^{2}}{3 d})$ $Ep2=(1/K)(Q^2/(3d))$
Therefore,this change in potential energy i.e
$(E p 1 - E p 2)$ $(Ep1-Ep2)$ has been converted to the kinetic energy of the moving charge i.e $(\frac{1}{K}) (\frac{2 Q^{2}}{3 d})$ $(1/K)((2Q^2)/(3d))$

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How do you determine kinetic energy?

Two equal point charges Q are separated by a distance of d. One of the charges released and moves away from the other due only to the electrical force between them. When the moving charge is a distance 3d away from the other charge, what is the kinetic energy?

1 Answer

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