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Q.

The pulleys and strings shown in the figure are smooth and of negligible mass. For the system to remain in equilibrium, the angle θ  should be:

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a

45°

b

30°

c

60°

d

0°

answer is C.

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Detailed Solution

For the equilibrium of the block 
2Tcosθ=2mg
 ⇒2mgcosθ=2mg

⇒cosθ=12

∴θ=45º

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