102. A copper wire of length 4.0m and area of cross-section 1.2
A copper wire of length 4.0m and area of cross-section 1.2 cm2 is stretched with a force of 4.8×103N. If Young’s modulus for copper is .2×1011 N/m2 the increase in the length of the wire will be
(a) 1.33 mm (b) 1.33 cm
(c) 2.66 mm (d) 2.66 cm
Answer-a
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a