A Steel rod of length 25 cm has a cross - sectional area of 0.8cm^(2). The force required to stretch this rod by the same amount as the expansion produced by heating it through 10^(@)C is (coefficient of linear expansion of steel is 10^(-5)//^(@)C and Young's modulus of steel is 2xx10^(10)N//m^(2)).................... .

A Steel rod of length 25 cm has a cross - sectional area of 0.8cm^(2).

1.	A Steel rod of length 25 cm has a cross - sectional area of 0.8cm^(2). The force required to stretch this rod by the same amount as the expansion produced by heating it through 10^(@)C is (coefficient of linear expansion of steel is 10^(-5)//^(@)C and Young's modulus of steel is 2xx10^(10)N//m^(2)).................... .
Answer» (a) 40 N (b) 80 N (c) 120 N (d) 160 N Solution :The REQUIRED force is GIVEN by `F=YA ALPHA Deltat=2xx10^(10)xx0.8xx10^(-4)xx10^(-5)xx10` `F=160N`