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A steel wire of cross section 1mm is heated at 60 C and tied between...

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A steel wire of cross section 1mm is heated at 60 C and tied between two ends firmly The co efficient of linear expansion for steel is a 1 1x10 5 C and Young s modulus Y 2 10 Pa The change in tension in the wire when temperature becomes 30 C is 1 44N 2 55N 3 66N 4 77N

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