Question $11$

$2$ pts

A wire $1$ mm in diameter is connected to one end of a wire of the same material $2$ mm in diameter of twice the length. A voltage source is connected to the wires and a current is passed throught the wires. If it takes time $T$ for the average conduction electron to traverse the $1-$mm wire, how long does it take for such an electron to traverse the $2-mm$ wire?

$174$

$T$

$4T$

$8T$