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Q.

The coefficient of static friction, µs between block A of mass 2 kg and the table as shown in figure, is 0.2.

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What would be the maximum mass value of block B so that the two blocks do not move ? The string and the pulley are assumed to be smooth and massless. (g = 10 m/s2)

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a

2.0 kg

b

0.2 kg

c

4.0 kg

d

0.4 kg

answer is D.

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Detailed Solution

The different forces acting on the two masses are shown in fig.

Question Image

ln equilibrium, T = M g   …(1)

Further T= µmg …(2)

∴Mg=μmgM=μm=0⋅2×2=0⋅4kg

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