A wire of uniform area of cross section is streched to four time its original length by what factor doea its resistivity change and resistance will change
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it will be four times comparison than bfor
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Resistivity will not change as it is independent of length and area of cross section
Moreover
Using R=¶l/A where ¶ denotes resistivity
If l new = 4l
But volume remains constant so
πr2l = πr(new)2l(new)
r2l= r(new)^2*4l
r(new) = r/2
R ( new) =¶ 4l/πr^2/4
R( new) = 16 times R (original )
Moreover
Using R=¶l/A where ¶ denotes resistivity
If l new = 4l
But volume remains constant so
πr2l = πr(new)2l(new)
r2l= r(new)^2*4l
r(new) = r/2
R ( new) =¶ 4l/πr^2/4
R( new) = 16 times R (original )
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