When the load on a wire is slowly increases from 3 to 5 kg-wt, the elongation increases from 0.61 to 1.02 mm. The work done during the extension of wire is:

Work done = 12 stretching force ×extension.Net work done in increasing the length from 0.164 mm to 1.02 mm isW2-W1 = 12×5×9.8×1.02×10-3-12×3×0.61×9.8×10-3              = 0.016 JSo the correct choice is (2).