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Electric Current in Conductors — Physics STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 SciencePhysicsElectric Current in Conductors1 Mark
Question
The drift speed is defined as $\text{v}_\text{d}=\frac{\Delta\text{l}}{\Delta\text{t}}$ where $\Delta\text{l}$ is the distance drifted in a long time $\Delta\text{t}.$ Why don't we define the drift speed as the limit of $\frac{\Delta\text{l}}{\Delta\text{t}}\ \text{as}\ \Delta\text{t}\rightarrow0?$
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Answer

As electron doesn't travel linearly so we need to calculate average time thus we need to consider drift distance for long time. That can not be calculated in case of t → 0.

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