. A rigid bar of mass 15 kg is supported symmetrically


symmetrically by three wires each 2.0 m long. Those at each end are of copper and the middle one is of iron. Determine the ratios of their diameters if each is to have the same tension.

 

 

Best Answer

 

Explanation:

Young’s modulus is

Y = Stress / Strain

Y = (F/A) / Strain

Y = (4F/d2) / Strain

F = Tension force

A = Area of cross-section

d = Diameter of the wire

Let,d1,d2 be the diameter of iron wire and copper wire

The ratio of their diameters is ;

 diameters

Final Answer:

Hence, The ratios of their diameters if wire have the same tension is 1:1.25

 

 

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