Drift speed is defined as vd = Δl/Δt, where Δl is the distance drifted in a long time Δt. Why don't we define drift speed as the limit of Δl/Δt as Δt → 0?
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Therefore, we can't describe drift speed or velocity as the limit of Δl / Δt as Δt → 0 because this is a short time period which is not sufficient to obtain the desired result.
Explanation:
- Under the impact of an existing electric field an electron drifts. An electron takes a very random direction in the process of the movement.
- So, we have a much more long time to take average. Therefore, we can't describe drift speed or velocity as the limit of Δl / Δt as Δt → 0 because this is a short time period which is not sufficient to obtain the desired result.
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