First slide

Drift velocity

Question

A potential difference of V is applied at the ends of a copper wire of length l and diameter d. On doubling only d, drift velocity

Easy

A

becomes two times
B

becomes half
C

does not change
D

becomes one fourth

Solution

Drift velocity $ν_{d} = \frac{V}{ρ \ln e}; ν_{d}$ does not depend upon diameter.

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