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Q.

In the pulley arrangement shown, the pulley P2 is movable. Assuming coefficient of friction between m and surface to be μ, the minimum value of M for which m is at rest is

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a

M = μm2

b

m = μM2

c

M = m2μ

d

m = M2μ

answer is A.

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Detailed Solution

f = 2T---------(i)T = Mg-------(ii)If m be at rest friction will be staticf ≤ μN2Mg ≤ μmg ⇒ M = μm2
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