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1)

The increase  in energy of a metal bar of length L and  cross-sectional area A when   compressed with a load M along its length is (where, Y= Young's modulus of the material of metal bar )


A) FL2AY

B) F2L2AY

C) FL2AY

D) F2L22AY

Answer:

Option B

Explanation:

Energy = 12 x stress x strain x volume

 =  12(stress)2Y×volume

 =12(FA)2Y×LA  [ as stress = F/A, volume = L x A]

 or energy (E)= F2L2AY