A rigid bar of mass 15 kg is supported symmetrically by three wires each 2 m long. Those at each end are of copper and middle one is of iron. Determine the ratio of their diameters if each is to have the same tension. Young's modulus of elasticity for copper and steel are `110 xx 10^(9)Nm^(-2)` and `190 xx 10^(9)Nm^(-2)` respectively.

Explanation

To solve the problem of determining the ratio of the diameters of the wires made of copper and iron that support a rigid bar symmetrically, we can follow these steps:

### Step 1: Understand the Problem
We have a rigid bar of mass 15 kg supported by three wires (two copper and one iron). Each wire has the same length of 2 m, and we need to find the ratio of their diameters when the tension in each wire is the same.

### Step 2: Identify Given Data
- Mass of the rigid bar, \( m = 15 \, \text{kg} \)
- Length of each wire, \( L = 2 \, \text{m} \)
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