Question

Length of any wire becomes four times four times by stretching it, then what is value of new resistivity of material?

Answer 1

Answer:

resistivity will be same for the new stretched wire because resistivity is the characteristic property of a material it does not depend on length.

where new resistance is 16 times of the older one

Explanation:

R=pl/a

let l1,a1 be new lengths and new areas of cross section

l1=4*l

l2=a/4

R1=p* l1 /a1

   =p* 4*l/a/4

   =p *16 *l/a

   = 16*(p*l/a)

R1=16*R

hence derived

hope it helps

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