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24.A wire of length 50 cm and cross sectional area of 1 sq. mm is extended by 1 mm. The required work will be

24.A wire of length 50 cm and cross sectional area of 1 sq. mm is extended by 1 mm. The required work will be(Y=2×1010 N/m2)

(a)  6×10-6 J                                              (b)  4×10-6 J

(c)    2×10-6 J                                           (d)  1×10-6 J

Answer-c

(20)

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