First slide

Drift velocity

Question

A potential difference is applied across the ends of a metallic wire. If the potential difference doubled, the drift velocity

Easy

A

will be doubled
B

will be halved
C

will be quadrupled
D

will remain unchanged

Solution

The drift velocity is given by
$v_{d} = \frac{i}{neA} = \frac{V}{neAR} or v_{d} \propto V$
So, when the potential difference is doubled, the drift velocity will be doubled

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