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  4. Consider the system shown in figure. The wall is smooth, but the surfaces of blocks textA and textB in contact are rough. The friction on textB due to textA in equilibrium is <img class=img-fluid question-image alt=Question src=https://cdn.tardigrade.in/q/nta/p-jvm783hkucu65tpt.png />

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Q. Consider the system shown in figure. The wall is smooth, but the surfaces of blocks $\text{A}$ and $\text{B}$ in contact are rough. The friction on $\text{B}$ due to $\text{A}$ in equilibrium is

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NTA AbhyasNTA Abhyas 2022

Solution:

Considering $\text{A}$ and $\text{B}$ as a system. There is no vertical force in upward direction to support their weight. Therefore, the system cannot remain in equilibrium.