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Physics-

General

Easy

Question

The graph shows the behaviour of a length of wire in the region for which the substance obeys Hooke’s law. $P$ and $Q$ represent

$P =$ applied force, $Q =$ extension
$P =$ extension, $Q =$ applied force
$P =$ extension, $Q =$ stored elastic energy
$P =$ stored elastic energy, $Q =$ extension

The correct answer is: $P equals$ extension, $Q equals$ stored elastic energy

Graph between applied force and extension will be straight line because in elastic range
Applied force $proportional to$ extension
But the graph between extension and stored elastic energy will be parabolic in nature
As $U equals 1 divided by 2 blank k x to the power of 2 end exponent$ or $U proportional to x to the power of 2 end exponent$

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