\( K \) is the force constant of a spring. The work done in increasing its extension from \( l_{...

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\( K \) is the force constant of a spring. The work done in increasing its extension from \( l_{1} \) to \( l_{2} \) will be
[MP PET 1995; MP PMT 1996]
(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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