A rigid bar of mass 15 kg is supported symmetrically by three wires each 2 m long. Those at each end aer of copper and middle one is of iron. Determine the ratio of their diameters if each is to have the same tensoin. 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 copper and iron wires supporting a rigid bar, we will follow these steps:

### Step 1: Understand the Problem
We have a rigid bar of mass 15 kg supported symmetrically by three wires: two copper wires at the ends and one iron wire in the middle. Each wire is 2 m long, and we need to find the ratio of their diameters if each wire experiences the same tension.

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