A cylindrical wire has cross-sectional area $A$ and number density of free electrons $n$. The wire has current $I$ and the free electrons have average drift speed $v$.
A second cylindrical wire has cross-sectional area $0.5A$ and number density of free electrons $2n$. In this wire, the free electrons have average drift speed $2v$.
What is the current in the second wire?
1 )
$0.5I$
2 )
$I$
$2I$
4 )
$4I$
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