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Questions  

A light string of 70 cm has its two ends tied at the same level 50 cm apart. A force of 100 N is applied at a distance of 30 cm from P. The tension in part PR is

 

a
18 N
b
8 N
c
0 N
d
80 N

detailed solution

Correct option is D

Here T1 cos (90-θ)+T2 cos θ = 100And T1 cos θ = T2 cos (90-θ)Solving, T1 = 80 N

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