A copper wire is to be replaced by an aluminium alloy wire of the same length and resistance. Copper has half the resistivity of the alloy.
What is the ratio = $\frac{diameter\;of \;alloy \;wire}{diameter\; of \;copper\; wire}$
$\sqrt 2 $
2 )
2
3 )
$2\sqrt 2 $
4 )
4
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