Question

Adjoining figure shows two blocks A and B pushed against the wall with 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 blocks to be at rest against the wall ?

• A. F should be more then the weight of A and B
• B. F should be equal to the weight of A and B
• C. F should be less then the weight of A and B
• D. system be in equilibrium

Answer 1

The correct option is D system be in equilibrium

Keeping $(A+B)$ as system there is no force in vertical direction.

$\therefore$ system be in equilibrium

So, option $D$ is correct answer.