Question

A steel wire of length 20 cm and uniform cross-section
1 mm² is tied rigidly at both the ends. The temperature of
the wire is altered from 40ºC to 20ºC. Coefficient of linear
expansion for steel a = 1.1 × 10⁻⁵/ºC and Y for steel is
2.0 × 10¹¹ N/m². The change in tension of the wire is
(a) 2.2 × 10⁶ newton (b) 16 newton
(c) 8 newton (d) 44 newton

Answer 1

Answer:

44 newton

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