(chatquestion)...* 37. A uniform wire of length L and radius r is twisted by an angle a. If modulus of rigidity of the wire is n, then the elastic potential energy stored in wire, is Tnr*a (1) 2L2 Tanr*a² 4L Tnr a (3) 4L2 ,2 Tenr*a? (4) 2L

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