If the shear modulus of a wire is 5.9*1011 dyne/cm2, then the potential energy of a wire of 4000 cm in diameter and 5 cm long twisted through a angle of 10 minutes ,in joule,is:
(a)1.253*10-12
(b)2.0*10-12
(c)1.0*10-12
(d)0.8*10-12
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