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Surface Tension — JEE physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceJEE physicsSurface Tension1 Mark
Question
Assertion : Graph between potential energy of a spring versus the extension or compression of the spring is a straight line.
Reason : Potential energy of a stretched or compressed spring, proportional to square of extension or compression.
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Answer

(e) Potential energy $U=\frac{1}{2} k x^2$ i.e. $U \propto x^2$This is a equation of parabola, so graph between $U$ and $x$ is a parabola, not straight line.

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