The extension of a stretched string is directly proportional to its tension. If the extension produced by a tension of 8 Newton’s is 2cm, find the extension produced by a tension of 12 newton’s.

Correct answer is D

Let the extension be E and the tension be T.

Then \(E \propto T\)

\(E = kT\)

when T = 8N, E = 2cm

\(2 = k \times 8\)

\(k = \frac{2}{8} = 0.25\)

\(\therefore E = 0.25T\)

when T = 12N, \(E = 0.25 \times 12 = 3cm\)

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