A) \[{{30}^{o}}\]
B) \[{{45}^{o}}\]
C) \[{{60}^{o}}\]
D) \[{{90}^{o}}\]
Correct Answer: D
Solution :
Tension at mean position, \[mg+\frac{m{{v}^{2}}}{r}=3mg\] \[v=\sqrt{2gl}\] ?(i) and if the body displaces by angle q with the vertical then \[v=\sqrt{2gl(1-\cos \theta )}\] ?(ii) Comparing (i) and (ii), \[\cos \theta =0\] Þ \[\theta =90{}^\circ \]You need to login to perform this action.
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