A) increase first then decrease
B) remain same
C) increase four time
D) decrease four times
Correct Answer: D
Solution :
The relation for drift velocity \[i=ne{{\upsilon }_{d}}A\] From it when current is constant \[A{{\upsilon }_{d}}\] is constant when radius is doubled, area becomes four times. Hence the drift velocity become one fourth\[\left( \frac{1}{4} \right)\].
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