65. A wire extends by 1 mm when a force is applied. Double the force is applied to another wire of same material and length but half the radius of cross-section. The elongation of the wire in mm will be
(a) 8 (b) 4
(c) 2 (d) 1
Answer-a
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a