- #1
Hamal_Arietis
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Homework Statement
Initial, 3 charges q are separated r at vertices of the equilateral triangle. Then they move freely to infinity.
Find the velocity of charge when they are in infinity.
Homework Equations
If we seem 1 charge is affected by potential of 2 charges, we have:
$$2\frac{kq^2}{r}=\frac{1}{2}mv^2$$
so ##v=2q\sqrt{\dfrac{k}{mr}}##
If we seem that they are a system. The energy of system charge is:
$$W=\frac{3kq^2}{r}$$
And potential energy will change to dynamic enegy.
$$ \frac{3kq^2}{r}=\frac{3}2mv^2$$
so ##v=\sqrt{2}q\sqrt{\dfrac{k}{mr}}##
The Attempt at a Solution
Where is wrong?
Thanks for helping