The drift velocity of electrons for a conductor connected in an electrical circuit is V d . The conductor is now replaced by another conductor with same material and same length but double the area of

Question

The drift velocity of electrons for a conductor connected in an electrical circuit is V d . The conductor is now replaced by another conductor with same material and same length but double the area of cross-section. The applied voltage remains same. The new drift velocity of electrons will be

TestHub · Accepted Answer

Drift velocity of electrons through a conductor kept in an external electric field is given by $V_{d} = - \frac{e E}{m} τ = - \frac{e V}{m l} τ$

Where, $e =$ magnitude of charge on electron, $m =$ mass of electron, $E =$ external electric field and $τ =$ average relaxation time.

As, drift velocity is independent of area. So, the new drift velocity of electrons will be $V_{d}$ .

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