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NEET 2020

NEET 2020 Physics question on Properties of Matter

A wire of length L, area of cross section A is hanging from a fixed support. The length of the wire changes to L1L_1 when mass M is suspended from its free end. The expression for Young's modulus is:
  1. A.
    Mg(L1−L)AL\dfrac{Mg(L_1 - L)}{AL}
  2. B.
    MgLAL1\dfrac{MgL}{AL_1}
  3. C.
    MgLA(L1−L)\dfrac{MgL}{A(L_1 - L)}
  4. D.
    MgL1AL\dfrac{MgL_1}{AL}
Show answer

Correct option: C

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