A wire has a resistance of 6 ohm.What will be the resistance of another wire of same lenght and half the cross section area-
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Given that both the wire is made up of same material therwfore they will have same resistivity
Which is = resistance*area/length
Therefore =6*a/l .1
Also for the second wire x*a/2/l .2
On dividing both rh eq.
X=12ohm
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