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A wire suspended vertically from one of its ends is stretched by attaching a weight of 200N to the lower end.

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A wire suspended vertically from one of its ends is stretched by attaching a weight of 200N to the lower end. The weight stretches the wire by 1mm. Then the elastic energy stored in the wire is

(a) 0.2J 

(b) 10J 

(c) 20J 

(d) 0.1J.

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(d) : Elastic energy per unit volume

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