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Two separate wires A and B are stretched...

Two separate wires A and B are stretched by 2 mm and 4 mm respectively, when they are subjected to a force of 2 N. Assume that both the wires are made up of same material and the radius of wire B is 4 times that of the radius of wire A. The length of the wires A and B
are in the ratio of a : b. Then `a/b` can be expressed as `1/x` where x is_______

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