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Q.

In figure coefficient of friction between m1 and m2 is μ and that between m1 and the wall is zero. A force F is pressing the system against the wall. Minimum value of force required to hold the system in equilibrium is:

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a

μm1g

b

μm2g

c

μm1+m2g

d

system cannot be held in equilibrium

answer is D.

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Detailed Solution

At any time, we can balance only mg force by frictional force, which shows system cannot be held in equilibrium.
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