Question

a wire of 10ohm resistance was stretched to double its length.calculate the new resistance of the wire​

Answer 1

Answer:

A wire of resistance 10 ohm is stretched to double its length. ... Thus resistance is equal to 20ohms. R is directly propotional to P(rho). the resistivity also be doubled.

Answer 2

The relation between resistance and length is directly proportional to each other..

R=kl

K= constant

Then R1/R2=l1/l2

10/R2=l/2l

R2=20 ohms

So if length is doubled then resistance is also doubled.