The speed of a transverse wave passing through a string of length 50 cm and mass 10 g is 60 ms -1 . The area of cross-section of the wire is 2.0 mm and its Young's modulus is 1.2 x 10 11 Nm -2 . The extension of the wire over its natural length due to its tension will be x 
10 -5 m. The value of x is_______.
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