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Two shafts 'A' and 'B' are made of same material. The shaft 'A' is solid and has diameter D. The shaft 'B' is hollow with outer diameter D and inner diameter D / 2. The strength of hollow shaft in torsion is

[A].	1 ? 16	[B].	1 ? 8
[C].	1 ? 4	[D].	15 ? 16

Answer: Option D

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