Physics

Physics

Problem

A silver wire of length 10 metre and cross-sectional area 10−8 m210^{-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 7×1010 N/m27\times 10^{10}\,\text{N/m}^2 and 1.59×10−8 Ω-m1.59\times 10^{-8}\,\Omega\text{-m} respectively. The increase in its resistance is equal to (keeping volume constant) (a) 0.0455 Ω0.0455\,\Omega (b) 0.455 Ω0.455\,\Omega (c) 0.91 Ω0.91\,\Omega (d) 0.091 Ω0.091\,\Omega (a) 0.0455 Ω0.0455\,\Omega (b) 0.455 Ω0.455\,\Omega (c) 0.91 Ω0.91\,\Omega (d) 0.091 Ω0.091\,\Omega

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