Mechanical Properties of Solids

Question: K is the force constant of a spring. The work done in increasing its extension from ${{l}_{1}}$ to ${{l}_{2}}$ will be

1) $K({{l}_{2}}-{{l}_{1}})$

2) $\frac{K}{2}({{l}_{2}}+{{l}_{1}})$

3) $K(l_{2}^{2}-l_{1}^{2})$

4) $\frac{K}{2}(l_{2}^{2}-l_{1}^{2})$

Solution:

Explanation: No Explanation

Work Done in Stretching a Wire

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