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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