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A metal rod of Young's modulus 2 x 10^10 Nm^-2 undergoes an elastic strain of 0.02% the energy per unit

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A metal rod of Young's modulus 2 x 1010 Nm-2 undergoes an elastic strain of 0.02% the energy per unit volume stored in the rod in joule/m3 is 

 (1) 400 

(2) 800 

(3) 1200 

(4) 1600 

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Correct option (1) 400 

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