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The potential difference across a metal wire is kept constant. The length 
and the diameter 
of the wire are both varied. The type of metal is kept the same. How is the current in the wire related to and ?
It is directly proportional to and inversely proportional to .
It is directly proportional to and inversely proportional to 
.
It is inversely proportional to and directly proportional to .
It is inversely proportional to and directly proportional to .
