Opposite charges attract.

Electric potential due to a point charge:

$\overline{){\mathbf{V}}{\mathbf{=}}\frac{\mathbf{k}\mathbf{q}}{\mathbf{r}}}$

An electron (q = −e) completes half of a circular orbit of radius r around a nucleus with Q = +3e.**(a)** How much work is done on the electron as it moves from i to f? Give either a numerical value if you knew the radius. Justify your answer.**(b)** By how much does the electric potential energy change as the electron moves from i to f?**(c)** Is the electron's speed at f greater than, less than, or equal to its speed at i?

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