Question

Two identical blocks of weight $W$ are placed one on top of the other as shown in the figure. The upper block is tied to the wall. The coefficient of static friciton between $B$ and the ground is $\mu$ and there is no friction between $A$ and $B$. When $F=\mu W$ force is applied on the lower block as shown, the tension in the string will be

• A. $\mu W$
• B. $\frac{\mu W}{2}$
• C. $0$
• D. $2\mu W$

Answer 1

The correct option is C $0$

Since, there is no friction between the blocks, there will not be any driving force acting on block $A$ in the horizontal direction.
Hence, the tension in the string will be zero.