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Two solid shafts and A and B are made of the same material. Shaft A is of 50 mm diameter and shaft B is of 100 mm diameter. The strength of shaft B is

         (a) 2 times as that of shaft A     

         (b) 4 times as that of shaft A

         (c) 6 times as that of shaft A

         (d) 8 times as that of shaft A

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