A metal wire of coefficient of linear expansion and Young modulus are `1xx10^(-5)//""^(@)C` and `10^(11)N//m^(2)` respectively is tied between two points rigidly at a temperature `40^(@)C`. If the temperature is decreased to `20^(@)C` the force required to hold the wire in newton is ( the length of the wire is 40 cm and area of cross section is `1 cm^(2)`)A. 20 NB. 200 NC. 2000 ND. 1000 N

A metal wire of coefficient of linear expansion and Young modulus are

1.	A metal wire of coefficient of linear expansion and Young modulus are `1xx10^(-5)//""^(@)C` and `10^(11)N//m^(2)` respectively is tied between two points rigidly at a temperature `40^(@)C`. If the temperature is decreased to `20^(@)C` the force required to hold the wire in newton is ( the length of the wire is 40 cm and area of cross section is `1 cm^(2)`)A. 20 NB. 200 NC. 2000 ND. 1000 N
Answer» Correct Answer - C `F=yA prop Delta t` `=10^(11) xx 10^(-4) xx 10^(-5) xx (40 xx 20) =10^(2) xx 20` `=2000N`.

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