Question

A sonometer wire having cross-sectional area 0.85 × 10−6

m2

is stretched between

two rigid supports 1.2 m apart. A tension of 20 N is applied at its free end. If the

temperature is reduced by 12°C, calculate the final tension in the wire. Take

coefficient of linear expansion (α) and isothermal Young’s modulus (γ) to be

1.5 × 10−5

K−1

and 2.0 × 1011 Nm−2

, respectively.

Answer 1

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