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184_notes:examples:week6_drift_speed [2017/09/26 15:58] – [Solution] tallpaul | 184_notes:examples:week6_drift_speed [2017/09/26 16:05] – [Solution] tallpaul | ||
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We now have enough information to solve for the drift speed of electrons. We use positive numbers below, since we care only about speed for now, not direction. | We now have enough information to solve for the drift speed of electrons. We use positive numbers below, since we care only about speed for now, not direction. | ||
- | $$v_{avg} = $$ | + | $$v_{avg} = \frac{I}{\pi r^2 n q}$$ |
+ | |||
+ | Current ($I$), radius ($r$), electron density ($n$), and electron charge ($q$) are all things we know for our two wires. When we plug in the numbers, we get the following: | ||
+ | \begin{align*} | ||
+ | v_{\text{avg, | ||
+ | \end{align*} |