Two steel rods &an alluminium rod of equal length are joined rigidly such that alluminium rod is above steel&another steel rod is above alluminium rod.All the rods are in a state of zero tension at 0oC.Find the length of the system when the temperature is raised to.coeffs. of linear expansions of alluminium&steel are
a and
s respectively.youngs modulus are Ya and Ys.