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Torsional rigidity is

[A].	The torque that produces rotation of unit r.p.m. in a shaft	[B].	The torque that transmits one HP at one r.p.m.
[C].	The torque that produces a twist of one radian in a shaft of unit diameter	[D].	The torque that produces a twist of one radian in a shaft of unit length
[E].	None of the above

Answer: Option D