First slide

Elastic Modulie

Question

The lengths of an elastic wire are a, b when the tensions in it are 10 N, 20 N respectively. If the tension in the same wire is 40 N then its length is

Moderate

A

b-2a
B

3b-2a
C

4b-3a
D

5b-3d

Solution

$\begin{array}{l} Let c is the length of the wire when the tension in the wire is 40 N \\ \frac{b - a}{c - b} = \frac{20 - 10}{40 - 20} \Rightarrow c = 3 b - 2 a \end{array}$

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