A steel wire, of uniform area 2 m 2 , is heated up to 50°C and is stretched by tying its ends rigidly. The change in tension, when the temperature falls from 50 °C to 30 °C is (Take Y = 2 × 10 11 N m - 2 , α = 1.1 × 10 - 5 ° C - 1 )

Question

A steel wire, of uniform area 2 m 2 , is heated up to 50°C and is stretched by tying its ends rigidly. The change in tension, when the temperature falls from 50 °C to 30 °C is (Take Y = 2 × 10 11 N m - 2 , α = 1.1 × 10 - 5 ° C - 1 ), 1 . 5 × 10 10 N, 5 N, 88 N, 2 . 5 × 10 10 N

MARKS App · Accepted Answer

∆ L = α L ∆ T = F A L Y ∴ F = α ∆ T A Y = 1 . 1 × 10 - 5 × 50 - 30 × 2 × 10 - 6 × 2 × 10 11 = 88 N

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