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
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a