Adjoining figure shows two blocks A and B pushed against the wall with a force F The wall is smooth

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Adjoining figure shows two blocks A and B pushed against the wall with a force F. The wall is smooth but the surfaces in contact of A and B are rough. Which of the following is true for the system of blocks to be at rest against the wall ?
(1) F should be be more than weight of A and B
(2) F should be equal to the weight of A and B
(3) F should be less than the weight of A and B
(4) system cannot be in equilibrium

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the video is awesome sir but plz clear my doubt
sir jab mg ke karan block B niche move karega to friction force bet. A and B act m aayega na aur us friction force ki value uN hogi aur N force ke magnitude pe depend hoga to agar hum boht high force lagate h tab to system rest m rehna chhiye na sir

abhijeet