Two similar round bars " \(a\) " and " \(b\) " are each \(0.3 \mathrm{~m}\) long a shown in Fig 13.54. The bar " \(a\) " receives an axial blow which produces a maximum stress of \(200 \mathrm{MPa}\). Find the maximum stress produced in bar " \(b\) " by the same blow.

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A 4 cm 0.2 m (a) B 2 cm D C 0.1 m- Fig. 13.54 4 cm E 2 cm F 0.1 m (b) 0.2 m