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Question

The pulley and string are shown in Fig. smooth and of negligible mass. For the system to remain in equilibrium, the angle θ should be
990371_ec223728cd76433081639fe5762ed949.png

A
00
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B
300
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C
450
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D
600
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Solution

The correct option is C 450
We know that,
Tension on the string =mg (i)
The component of T which is working Tcosθ
also, Tcosθ=2mg
Since there are 2 blocks,
2Tcosθ=2mg
2(mg)cosθ=2mg (from (i))
cosθ=12
θ=cos112
[C] θ=450

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