Which of the following graph depicts sprin

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Which of the following graph depicts spring constant $k$ versus length $l$ of the spring correctly

A

B

C

D

Which of the following graph depicts spring constant $k$ versus length $l$ of the spring correctly

$K = \frac{F}{x}$ and increment in length is proportional the original length i.e. $x \propto l$

$\therefore K \propto \frac{1}{l}$

It means graph between K and l should be hyperbolic in nature.