A massless uniform rod is subjected to force \( \mathrm{F} \) at its free end as shown in figure...

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A massless uniform rod is subjected to force \( \mathrm{F} \) at its free end as shown in figure. The ratio of tensile stress at plane \( P_{1} \) to stress at \( P_{2} \) is
(a) \( 1: 2 \)
(b) \( \sqrt{2}: 1 \)
(c) \( 1: 4 \)
(d) \( 3: 2 \)
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