# Problem: 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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###### FREE Expert Solution

Opposite charges attract.

Electric potential due to a point charge:

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

###### Problem Details

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?