Two steel wires having same length are suspended from a ceiling under the same load. If the ratio of their energy stored per unit volume is 1 : 4 , the ratio of their diameters is:

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d u d v = 1 2 stress × s t r e s s y = 1 2 F 2 A 2 y d u d v α 1 d 4 d u d v 1 d u d v 2 = d 2 4 d 1 4 = 1 4 d 1 d 2 = 4 1 / 4 d 1 d 2 = 2 : 1

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