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6. There are two wires of same material and same length while the diameter of second wire is 2 times the diameter of first wire, then ratio of extension produced in the wires by applying same load will be

(a)   1 : 1                                         (b)   2 : 1

(c)   1 : 2                                         (d)   4 : 1

Answer-d

(3)

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