Question

Consider the situation shown in the figure, find the tension in string $AB$ considering the pulley and string as frictionless and massless:

• A. $3\text{N}$
• B. $2\text{N}$
• C. $8\text{N}$
• D. Zero

Answer 1

The correct option is D Zero

As weight $=0.3\times 10=3\text{N}$ trying to slide the two block system,
but the maximum frictional force can provide by block B is $f_{\text{max}}=0.5\times 1\times 10=5\text{N}$,
Since, maximum friction provided by block B is greater than $3N$, tension in string between $A$ and $B$ is zero.
The correct option is (d).