A uniform steel wire of length 4m and area of cross-section 3×10-6m2 is extended by 1mm by the application of a force. If the youngs modulus of steel is 2×1011 Nm-2 the energy stored in the wire is___________________?

(A) 0.025J (X)
(B) 0.50J (X)
(C) 0.75J ()
(D) 0.100J (X)

Answers:  A uniform steel wire of length 4m and area of cross section 3×10-6m2 is extended by 1mm by the application of a force. if the youngs modulus of steels is 2×1011 nm-2 the energy stored in the wire is 0.75J.