Wires A and B are made from the same material. A has twice the diameter and three times the length of B . If the elastic limits are not reached, When each is stretched by the same tension, the ratio of energy stored in A to that in B is :

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2:3

3:4

3:2

6:1

answer is B.

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Detailed Solution

W=12(FA)2.VolumeY W α f2r2 l W α lr2 w1w2= 34

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