A wire of length L , area of cross section A is hanging from a fixed support. The length of the wire changes…

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. MgL1−LAL
  2. MgLAL1
  3. MgLAL1−L
  4. MgL1AL

Solution

We know that, 

Young's modulus, Y=FLAΔL

Given,

F=Weight of suspended body=Mg and ∆L=L1-L.

So, we can write

Y=MgLAL1-L

Asked in: NEET 2020 (Phase 1)

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