30. Increase in length of a wire is 1 mm when suspended by a weight. If the same weight is suspended on a wire of double its length and double its radius, the increase in length will
30. Increase in length of a wire is 1 mm when suspended by a weight. If the same weight is suspended on a wire of double its length and double its radius, the increase in length will
(a) 2 mm (b) 0.5 mm
(c) 4 mm (d) 0.25 mm
ANSWER-B
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a