A steel rod of radius R = 10 mm and length L= 100 cm is stretched along its length by a force F = 6.28 × 10⁴ N. If the Young’s modulus of steel is Y = 2 ×10¹¹ N/m², the percentage elongation in the length of the rod is : (a) 0.100 (b) 0.314 (c) 2.015 (d) 1.549
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it is option b
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