A silver wire of length 10 metre and cross-sectional area is suspended vertically and…

PHYSICS · Single correct · CBSE · Physics · Mechanical Properties of Solids · Mechanical Properties of Solids

Problem

A silver wire of length 10 metre and cross-sectional area

10^{-8}\,\text{m}^2

is suspended vertically and a weight of 10 N is attached to it. Young's modulus of silver and its resistivity are

7\times 10^{10}\,\text{N/m}^2

and

1.59\times 10^{-8}\,\Omega\text{-m}

respectively. The increase in its resistance is equal to (keeping volume constant) (a)

0.0455\,\Omega

(b)

0.455\,\Omega

(c)

0.91\,\Omega

(d)

0.091\,\Omega