Question

A wire of 10ohm resistance is stretched to thrice its original length . Calculate the new resistivity &new resistance

Answer 1

resistivity will not change because it is independent of length and area of cross section of the the wire.

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)
= 9R

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Answer 2

REFER TO THE ATTACHMENT........

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