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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

(7)

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