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A spool is kept in equilibrium on an inc...

A spool is kept in equilibrium on an incline plane as shown in figure. The inner and outer radii of the spool are in ratio `(r)/(R) = (1)/(2)`. The force applied on the thread (wrapped on part of radius r) is horizontal. Find the angle that the force applied by the incline on the spool makes with the vertical.
[Take `tan^(-1) ((sqrt3)/(5)) cong 19^(@)` ]

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The correct Answer is:
`41^(@)`
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