question_answer

A rigid bar of mass 15 kg is supported symmetrically by three wires each 2 m long. The wires at each end are of copper and middle one is of iron. The ratio of the diameters of the copper to iron wire if each has the same tension is [Young's modulus of elasticity for copper and iron are \[110\times {{10}^{9}}N/{{m}^{2}}\] and \[190\times {{10}^{9}}N/{{m}^{2}}\]respectively.]

Answer:

1.31