Two wires made of the same material are clamped rigidly at one end and pulled by the same force on the other end. The length and the radius of the first wire are three times those of the second wire. If $x$ is the increase in the length of the first wire,then the increase in the length of the second wire is
- A$\frac{1}{3} x$
- B$3 x$
- C$9 x$
- D$\frac{1}{9} x$
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