a wire of 10 ohm resistance is stretched to thrice of its original length what will be the new resistivity and new resistance???
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Answer:resistivity will not change because it is independent of length and area of cross section of the the wire.
Explanation:
R=10ohm
original length=l
new length=l' =3l
then area will also decrease by three times
so
R'=rho *l'/area'
=rho*3l/(area/3)
=rho*9l/area
=9 (rho*l/area)
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