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# A potnetial difference of V is applied at the ends of a copper wire of length l and diameter d. On doubling only d, what is the change in drift velocity?

Khimraj
3007 Points
2 years ago
As drift velocity $v_{d} = \propto 1/A \propto 1/d^{2}$
So on doubling d drift velocity will reduce by 4 times and become ¼ of its initial.
Hope it clears..