Which of the following substances has the highest value of the young's modulus?

Steel

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Rubber

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wood

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Plastic

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Solution

The correct option is A Steel
$\begin{matrix} we know, young's modulus = \frac{Stress}{strain} \end{matrix}$
$\begin{matrix} Y = \frac{F L}{A Δ L} Y α \frac{1}{Δ L} \end{matrix}$
$\begin{matrix} By observation, Δ L in case of steel is smallest. So Y (young's modulus) will be highest for steel. \end{matrix}$

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