19.When a force is applied on a wire of uniform cross-sectional area
19.When a force is applied on a wire of uniform cross-sectional area 3×10-6 m2 and length 4m, the increase in length is 1 mm. Energy stored in it will be (Y=2×1011 N/m2)
(a) 6250 J (b) 0.177 J
(c) 0.075 J (d) 0.150 J
Answer-c
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a