A light wire of length L, area of cross section A is hanging from fixed support. If a mass M is suspended from its free end, then strain produced in the wire will be (symbols have their usual meaning)
A
Mg2YA
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B
MgYA
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C
2MgYA
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D
Zero
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Solution
The correct option is BMgYA Young’s modulus of elasticity is Y=StressStrain Strain(ΔLL)=MgAY