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A wire of length L, area of cross-section A is hanging from a fixed support.

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

(1) Mg(L1 - L)/AL

(2) MgL/AL1

(3) MgL/A(L1 - L)

(4) MgL1/AL

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Correct answer: (3) MgL/A(L1- L)

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