The potential difference across a metal wire is kept constant. The length l and the diameter $d$ of the wire are both varied. The type of metal is kept the same.
How is the current in the wire related to l and $d$?
1 )
It is directly proportional to $l$ and inversely proportional to $d$.
2 )
It is directly proportional to $l$ and inversely proportional to $d^2$.
3 )
It is inversely proportional to $l$ and directly proportional to $d$.
It is inversely proportional to $l$ and directly proportional to $d^2$.
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