A string is wrapped round a log of wood and it is pulled with a force F as shown in the figure. Choose the correct statement(s)I. Tension T in the string decreases with increases in θ.II. Tension T>F if θ>π/3
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a
only (I) is true
b
both are true
c
only (II) is true
d
both are wrong
answer is C.
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Detailed Solution
2Tcosθ=F⇒T=F2cosθif θ↑, then cosθ↓, so T↑and if T>F, then 2cosθ<1⇒θ>π3