Rotational Motion

JEE Main level, single correct, medium

105 of 280

Question 105 of 280

A square Lamina OABC of length 10 cm is pivoted at 'O'. Forces act at Lamina as shown in figure. If Lamina remains stationary, then the magnitude of F is :

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Answer: (C) 10 N

Since the lamina is equilibrium.
∴Fnet=0&τnet=0\therefore \mathrm{F}_{\mathrm{net}}=0 \& \tau_{\mathrm{net}}=0

To=10ℓ−Fℓ⇒F=10 N\mathrm{T}_{\mathrm{o}}=10 \ell-\mathrm{F} \ell \Rightarrow \mathrm{F}=10 \mathrm{~N}

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