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A conductor of length I is connected to ...

A conductor of length I is connected to d.c. source of potential v. if the length of the conductor is doubled by stretching it, keeping V constant, explain how do to following factors vary in the conductor Drift velocity.

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Drift velocity `u_(d)=(ev)/(ml)tau`
When l is doubled, drift velocity, become `(1)/(2)` times that original `v_(d)`
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