Correct Answer: Option C

Explanation

From the diagram given in the question

Change in length = (6.5 - 5.0) x 10\(^{-2}\)m

Change in force(wg) = (420 - 200) x 10 x 10\(^{-3}\) = 2.5N ( g changed to kg)

extension per unit x = \(\frac{\Delta l}{\Delta F}\) = \(\frac{1.5 \times 10^{-2}}{2.5}\) = 6.0 x 10\(^{-3}\)

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