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A steel wire of radius 1 mm and length 4...

A steel wire of radius 1 mm and length 40 cm is twisted through an angle `45^(0)`. The rigidity modulus of the material of the wire is `9 xx 10^(10)N//m^(2)`. The work done is

A

0.324 J

B

0.214 J

C

0.109 J

D

0.005 J

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