A copper wire 3m long and 1mm^2 in cross-section is fixed at one end and a weight of 10 kg is attached at the free end. If E for copper is 12.5x10^10 N/m^2 and ? = 0.25. find the extension, lateral strain and the lateral compression produced in the wire.

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Strain energy

The term strain indicates the variation in an object's length, area, and volume when the object is subjected to an external force. The external force may be of normal, shear, moment, torque, etc. The strain in an object depends on the types of external force and cross-section of the object. Mathematically, the evaluation of strain can be obtained with the help of elastic constants.