Question: A string of length 90 cm is fastened to two points A and B at the same level 60 cm apart. A ring weighing 120 g is slided on the string. A horizontal force P is applied to the ring such that it is in equilibrium vertically below B . The value of P is :
Options
A : 40 g
B : 60 g
C : 80 g
D : 100 g.
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