Opposite charges attract.
Electric potential due to a point charge:
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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