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A uniform wire of length L and radius r ...

A uniform wire of length L and radius r is twist by an angle `alpha`. If modulus of rigidity of the wire is `eta`, then the elastic potential energy stored in wire

A

`(pietar^4alpha)/(2L^2)`

B

`(pietar^4alpha^2)/(4L)`

C

`(pietar^4alpha)/(4L^2)`

D

`(pietar^4alpha^2)/(2L)`

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