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Define drift velocity and write its rela...

Define drift velocity and write its relationship with the current flowing through it.

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The drift is defnied as the averge velocity with which free electrons in a conductor get drifted under the influence of an external electric applied across the conductor.
The relation between drift velocity of free electrons the ciruit flowing through the conductor is `I eta A ev_(d)` e-charge of the electron n-no of free electrons in the conductor, A-area of cross-section.
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