The graph shows the behaviour of a length of wire in the region for which the substance obeys Hook’s law. $P$ and $Q$ represent
Medium
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(c) Graph between applied force and extension will be straight line because in elastic range,
Applied force $\propto$ extension
but the graph between extension and stored elastic energy will be parabolic in nature
As $U = 1/2\,\,k{x^2}$or $U \propto {x^2}$.
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