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

(a) $K\left({l}_{2}-{l}_{1}\right)$                             (b) $\frac{K}{2}\left({l}_{2}+{l}_{1}\right)$

(c) $K\left({l}_{2}^{2}-{l}_{1}^{2}\right)$                            (d) $\frac{K}{2}\left({l}_{2}^{2}-{l}_{1}^{2}\right)$

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Concept Questions :-

Elastic potential energy
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