A wire of length L, are of cross section A is hanging from a fixed support. The length of the wire changed to L1 when mass M is suspended from its free end. The expression for Young's modulus is :

Question

A wire of length L, are of cross section A is hanging from a fixed support. The length of the wire changed to L₁ when mass M is suspended from its free end. The expression for Young's modulus is :

${{Mg\left( {{L_1} - L} \right)} \over {AL}}$

${{MgL} \over {A{L_1}}}$

${{MgL} \over {A\left( {{L_1} - L} \right)}}$

${{Mg{L_1}} \over {AL}}$

Solution

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