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NEET 2015 (AIPMT, Cancelled Paper) · Torque, Couple & Equilibrium of Rigid Bodies

Torque, Couple & Equilibrium of Rigid Bodies question from NEET 2015 (AIPMT, Cancelled Paper)

Q41NEET 2015 · AIPMT · CANCELLED PAPERMedium

Torque, Couple & Equilibrium of Rigid Bodies

A rod of weight W is supported by two parallel knife edges A and B and is in equilibrium in a horizontal position. The knives are at a distance d from each other. The centre of mass of the rod is at distance x from A. The normal reaction on A is

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Answer: (b)

Take moments about B so that $N_B$ drops out.
$N_A$ acts at distance $d$ from B; W acts at distance $(d-x)$ from B.
$N_A d = W(d-x) \Rightarrow N_A = \frac{W(d-x)}{d}$
So the answer is (b).

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