A composite wire of uniform diameter 3mm consisting of copper wire of length 2.2 m and a steel wire of length 1. 6m stretches under a load by 0.7mm. Calcualte the load, given that the Young's modulus of copper is `1.1 xx 10^(11) Pa` and for steel is `2.0 xx 10^(11) Pa`.

Explanation

To solve the problem step by step, we will follow the principles of Young's modulus and the properties of composite materials.

### Step 1: Understand the given data
- Diameter of the wire, \( d = 3 \, \text{mm} = 3 \times 10^{-3} \, \text{m} \)
- Radius of the wire, \( r = \frac{d}{2} = 1.5 \times 10^{-3} \, \text{m} \)
- Length of copper wire, \( L_c = 2.2 \, \text{m} \)
- Length of steel wire, \( L_s = 1.6 \, \text{m} \)
- Total extension, \( \Delta L_{\text{total}} = 0.7 \, \text{mm} = 0.7 \times 10^{-3} \, \text{m} \)
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