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The drift velocity of electrons in a conductor connected to a battery is given by . Here, is the…
The drift velocity of electrons in a conductor connected to a battery is given by $v_d = -eE\tau/m$. Here, $e$ is the charge of the electron, $E$ is the electric field, $\tau$ is the average time between collisions and $m$ is the mass of the electron.
Based on this, answer the following:
(a)
How does the drift velocity change with a change in the potential difference across the conductor?
(b)
A copper wire of length '$l$' is connected to a source. If the copper wire is replaced by another copper wire of the same area of cross-section but of length '$4l$', how will the drift velocity change? Explain your answer.
Answer
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From ISC 2025 Specimen Physics Paper 1, question 10(ii).