If $k$ is the spring constant and $x$ is the deformation, the magnitude of spring force is given by

$F = 2 k x^{2}$

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$F = k x$

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$F = 2 k x$

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$F = k x^{4}$

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Solution

The correct option is B
$F = k x$

Spring force is directly proportional to the deformation (elongation or compression).

$F \propto x$

$\Rightarrow F = k x$ where $k$ is the spring constant.

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