A metal bar of length L area of cross section A, Young's modulus Y and coefficient of linear expansion a is clamped between two stout pillars. What is the force exerted by the bar when it is heated through t `^@C`?

An iron bar of length L cross sectional A and young modulus Y is pulled by a force from ends so as to produce an elongation l . Which of the following statements is correct ?

A wire length L and cross sectional area A is made of material of Young's modulus Y . It is strectched by an amount X . The work done is

Two metalic wires of same length an d same cross - section but different Young modulus are pulled by same force . Which wire will be elangated more ?

A brass wire 1.8 m long at 27^@C is held taut with little tension between two rigid supports. If the wire is cooled to a temperature of 39 ^@C , what is the tension developed in the wire, if its. diameter is 2.0 mm? Co-efficient of linear expansion of brass = 2.0 XX 10^-5 K^-1 Young’s modulus of brass = 0.91xx10^11 P