Question

A copper wire il strached to make 2% long what is the fractional change in resistance​

Answer 1

Explanation:

R=ρ

A

L

On stretching a wire its length increases but its area of cross section decreases, and volume remains constant.

V=AL

⟹R=ρ

V

L

2

⟹R∝L

2

Hence,

R

ΔR

=2

L

ΔL

Hence, for

L

ΔL

=0.1%

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