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(C) The relationship between drift velocity $v_d$ and current $i$ is given by the formula $i = n e A v_d$,where $n$ is the number density of electrons

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$v$

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(C) The relationship between drift velocity $v_d$ and current $i$ is given by the formula $i = n e A v_d$,where $n$ is the number density of electrons,$e$ is the charge of an electron,and $A$ is the area of cross-section.From this,the drift velocity is $v_d = \frac{i}{n e A}$.In the first case,$v_1 = v = \frac{i}{n e A}$.In the second case,the current is $i' = 2i$ and the area is $A' = 2A$.Therefore,the new drift velocity $v_2$ is $v_2 = \frac{i'}{n e A'} = \frac{2i}{n e (2A)} = \frac{i}{n e A}$.Comparing the two,we get $v_2 = v_1 = v$.

When the current $i$ is flowing through a conductor,the drift velocity is $v$. If $2i$ current is flowed through the same metal but having double the area of cross-section,then the drift velocity will be

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