JEE Main Physics question
Two persons are holding a rope of negligible weight tightly at its ends so that it is horizontal. A 15 kg weight is attached to the rope at its mid-point, which then no longer remains horizontal. The minimum tension required to completely straighten the rope is
Answer: (D)
Solution
For equilibrium, 2T cosθ = mg ⟹ T = mg/(2cosθ). For the string to become exactly horizontal, θ → 90°, cosθ → 0, so T → ∞.