# An electron ((q=-e)) completes half of a circular orbit of radius (r) around a nucleus with (Q=+3

## Question:

An electron \((q=-e)\) completes half of a circular orbit of radius \(r\) around a nucleus with \(Q=+3 e\), as shown in Figure Q21.4.

**a.** How much work is done on the electron as it moves from \(\mathrm{i}\) to \(\mathrm{f}\) ? Give either a numerical value or an expression from which you could calculate the 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?

**d.** Are your answers to parts a and c consistent with each other?

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**Related Book For**

## College Physics A Strategic Approach

**ISBN:** 9780321907240

3rd Edition

**Authors:** Randall D. Knight, Brian Jones, Stuart Field